求解一道语法

leechole · 发表于 2012-11-27 16:34:23

Researchers agreed that the study of newtreatments for heart attack patients was extremely important but more research was needed to determine that balloon angioplasty preceded withultrasound was or was not any better for heart attack patients than theballoon procedure by itself.

A. more research was needed to determinethat balloon angioplasty preceded with ultrasound was or was not any better forheart attack patients than
B．more research was needed for determiningwhether or not balloon angioplasty preceded by ultrasound is any better for heart attack patients than is
C．that more research was needed to determine whether balloon angioplasty preceded by ultrasound is any better for heart attack patients than
D．that more research was needed to determine that balloon angioplasty preceded with ultrasound was any better for heart attack patients than
E．that more research was needed for determining that balloon angioplasty preceded by ultrasound is or is not anybetter for heart attack patients than is
答案是C 但是前面不是都是过去时么为什么后面是现在时？

TerraceHo · 发表于 2012-11-27 21:16:14

【Ron‘s解釋】
if you're talking about GENERAL TRUTHS, then you use the present tense (regardless of the tense(s) in the surrounding context).
the only exception is for things that WERE general truths, but are no longer. in that case, of course, you'd use the past tense. (or, for things that WILL BE general truths but aren't yet, you should use the future tense.)
e.g.
in 1628, william harvey discovered that human blood circulates through the arteries and veins.
CORRECT
"discovered" --> past tense (since this happened in 1628)
"circulates" --> present tense (since this is a GENERAL TRUTH)

in 1628, william harvey discovered that human blood circulated through the arteries and veins.
INCORRECT
this implies that blood doesn't circulate anymore in today's humans.

jeffjarrett · 发表于 2012-11-28 04:10:48

因为真正的平行是语意上的平行，而不是语法上的平行。

例如Tom Hanks won the oscar award twice and he will win the next one in 2013 because he was slightly better overall than Brad Pitt.

求解一道语法

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