46. A study commissioned by the Department of Agriculture showed that if calves exercise and associated with other calves, they will require less medication and gain weight quicker than do those raised in confinement.
(A) associated with other calves, they will require less medication and gain weight quicker than do
(B) associated with other calves, they require less medication and gain weight quicker than
(C) associate with other calves, they required less medication and will gain weight quicker than do
(D) associate with other calves, they have required less medication and will gain weight more quickly than do（E）
(E) associate with other calves, they require less medication and gain weight more quickly than
Choice E, the best answer, uses the adverbial phrase more quickly than to modify the verb phrase gain weight. In A, B, and C, quicker than is incorrect because an adjective should not be used to modify a verb phrase. E is also the only choice with consistent verb tenses. The first verb in the clauses introduced by showed that is exercise. A and B incorrectly compound that present tense verb with a past tense verb, associated. C and D correctly use associate, but C follows with the past tense required and D with the present perfect have required. Both C and D incorrectly conclude with the future tense will gain.
如果D错误的地方都正确，这个do是不是多余呢？
do不是多余的问题，而是一个错误。
more that前面的助动词一个是have, 一个是will, do无法与前面平行。
应该正确。
LZM的语法书上说尽量补出谓语助动词。但是，OG里很多题目都不补的，而且很多错误选项都是因为补出的助动词形式是错误的。
这题补aux会比较好, 但因为SC是选最好的答案, 所以五个选项只有(E)较好
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