1、Astronomers predict that sometimes within the next three decades a star in one of nearby galaxies will have expanded in order to become a neutron star, as many stars in the centuries past have done.
A
B expand to become a neutron star , as many star in centuries past have done.
C have expanded so that it can become a neutron star , as did many stars in centuries past already.
D expand to become a neutron star , as many stars of centuries past have done .
E have expanded that they will become neutron stars, as the stars of centuries past have done.
2、Studies on criminal rehabilitation, particularly on patterns that occur in the parole system , show that criminals convicted of certain violent crimes stand a worse chance of being paroled early than do criminals convicted of non-violent crimes.
A
B a worse chance to be paroled early than are those
C less likely to be paroled early than those criminals.
3、3、Those who are concerned about the environment question if the timber industry , interested in cost-efficiency, might not be initiating a program that increase productivity but polluted nearly rivers and streams.
A
C question whether the timber industry, interested in cost-efficiency , might not initiate
E wonder whether the timber industry, with its interest in cost efficiency , initiated
Let me try.
1. B.
2. A.
3. C.
If you have questions from Princeton, they normally come with solutions and explainations. well, hope the following lines shine some light for you.
1. 时态. will have expand 不对，这种将来完成时很少用，而且此处也没有时间暗示要用此时态。
排除 ACE. 比较 BD。
(B) stars in centuries past vs. (D) stars of centries past
二者表达的含义不同，in centuries past 是时间壮语，与其后的完成时连用。
而stars of centries past 是所有格机构。
2。在比较结构中，尽量补出助动词。
(A) than do criminals 补出了 do
(B) than are those 补出了Are, 但是补错了, to do 表示一次性的有目的的动作，
此处用此不表示通常的现象
(C) than those 没有补出助动词，
stand less likely to be paroled early than 不如 stand worse chance 更明确为什么不被 early parol
3. 在表示“是否”时，用 whether 不用 if. A is out.
(C) whether .... might not... 用 whether ... not ... 是语义重复。
而且，whether 有不确定语气，might 也有不确定语气, redundant.
(E) 没有上述缺点。
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