举几个例子，首先：
OG13 126. The use of lie detectors is based on the assumption that lying produces emotional reactions in an individual
that, in turn, create unconscious physiological responses.
(A) that, in turn, create unconscious physiological responses
(B) that creates unconscious physiological responses in turn
(C) creating, in turn, unconscious physiological responses
(D) to create, in turn, physiological responses that are unconscious
(E) who creates unconscious physiological responses in turn
此题答案选A
GMAC给出的解释是：This sentence describes a cause-and-effect sequence，In turnis best placed before the verb of the second relative clause,
create, to clarify that a chain of events is being described.（节选）
以上似乎暗示着因果关系的谓语要保持一个时态
In turnis best placed before the verb of the second relative clause,
create, to clarify that a chain of events is being described.（节选）
以上似乎暗示着因果关系的谓语要保持一个时态
再举一个例子：
OG13-2
Manufacturers rate batteries in watt-hours;if they rate the watt-hour higher, the longerthe battery can be expected to last.
(A) if they rate the watt-hour higher, the longer
(B) rating the watt-hour higher, it is that much longer
(C) the higher the watt-hour rating, the longer
(D) the higher the watt-hour rating, it is that much longer that
(E) when the watt-hour rating is higher, the longer it is
答案是C
GMAC的解释是：
There is a cause-and-effect connection between the watt-hour rating and the battery life; therefore, the phrases describing the cause and effect
have to be expressed in two parallel grammatical constructions using the two comparative
forms of the modifiershigherandlonger.
这里明确指出同形态
最后一例：
OG13-3333.Because an oversupply of computer chips has sent prices plunging,
the manufacturer has announced that it will cut production by closing its factories for two days a month.
(A) Because an oversupply of computer chips has sent prices plunging,
(B) Because of plunging prices for computer chips, which is due to an oversupply,
(C) Because computer chip prices have been sent plunging, which resulted from an oversupply,
(D) Due to plunging computer chip prices from an oversupply,
(E) Due to an oversupply, with the result that computer chip prices have been sent plunging,
33.Because an oversupply of computer chips has sent prices plunging,
the manufacturer has announced that it will cut production by closing its factories for two days a month.
(A) Because an oversupply of computer chips has sent prices plunging,
(B) Because of plunging prices for computer chips, which is due to an oversupply,
(C) Because computer chip prices have been sent plunging, which resulted from an oversupply,
(D) Due to plunging computer chip prices from an oversupply,
(E) Due to an oversupply, with the result that computer chip prices have been sent plunging,
答案是A
因果关系前后后都使用了现在完成时，是巧合吗？还是因果关系真的有同形态（时态）的问题。
此问题看过DUKB24大神的千行总结，说明这个因果的时态是有先后的，没有刻意保持一致的意思。
那么请问，所有的因果关系到底是否有这个一直形态的问题，还是33题是个特例？
问题太诡异，还望大家见谅，整理不出好的思绪来。。。
This sentence describes a cause-and-effect sequence，In turnis best placed before the verb of the second relative clause,
create, to clarify that a chain of events is being described.（节选）
以上似乎暗示着因果关系的谓语要保持一个时态
In turnis best placed before the verb of the second relative clause,
create, to clarify that a chain of events is being described.（节选）
以上似乎暗示着因果关系的谓语要保持一个时态
再举一个例子：
OG13-2
Manufacturers rate batteries in watt-hours;if they rate the watt-hour higher, the longerthe battery can be expected to last.
(A) if they rate the watt-hour higher, the longer
(B) rating the watt-hour higher, it is that much longer
(C) the higher the watt-hour rating, the longer
(D) the higher the watt-hour rating, it is that much longer that
(E) when the watt-hour rating is higher, the longer it is
答案是C
GMAC的解释是：
There is a cause-and-effect connection between the watt-hour rating and the battery life; therefore, the phrases describing the cause and effect
have to be expressed in two parallel grammatical constructions using the two comparative
forms of the modifiershigherandlonger.
这里明确指出同形态
最后一例：
OG13-3333.Because an oversupply of computer chips has sent prices plunging,
the manufacturer has announced that it will cut production by closing its factories for two days a month.
(A) Because an oversupply of computer chips has sent prices plunging,
(B) Because of plunging prices for computer chips, which is due to an oversupply,
(C) Because computer chip prices have been sent plunging, which resulted from an oversupply,
(D) Due to plunging computer chip prices from an oversupply,
(E) Due to an oversupply, with the result that computer chip prices have been sent plunging,
33.Because an oversupply of computer chips has sent prices plunging,
the manufacturer has announced that it will cut production by closing its factories for two days a month.
(A) Because an oversupply of computer chips has sent prices plunging,
(B) Because of plunging prices for computer chips, which is due to an oversupply,
(C) Because computer chip prices have been sent plunging, which resulted from an oversupply,
(D) Due to plunging computer chip prices from an oversupply,
(E) Due to an oversupply, with the result that computer chip prices have been sent plunging,
答案是A
因果关系前后后都使用了现在完成时，是巧合吗？还是因果关系真的有同形态（时态）的问题。
此问题看过DUKB24大神的千行总结，说明这个因果的时态是有先后的，没有刻意保持一致的意思。
那么请问，所有的因果关系到底是否有这个一直形态的问题，还是33题是个特例？
问题太诡异，还望大家见谅，整理不出好的思绪来。。。
时态我从来不看这个考点