这里为什么省略了动词？

lemonee · 发表于 2003-8-25 07:51:00

. 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.
(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)    associate with other calves, they require less medication and gain weight more quickly than
E选项为什么没有DO。这里动词是可以省略的吗？如果加 DO算错吗？
谢谢了！

lemonee · 发表于 2003-8-25 12:10:00

高手出招呀！高手出招呀！

merlion · 发表于 2003-8-25 13:19:00

我也不是很明白。不过后来发现不会出现than后有动词和无动词需二选一的情况，都可以吧。"required" (c) and "have required" (d) use wrong tense ba

还是等高手解释吧

lilyhuang · 发表于 2003-8-26 14:54:00

I'm not supergirl, just for your information.
The comparison objects appear behind the verbs(require less medication, gain weight more quickly). You can incorporate the kind of comparison as one category, such as OG149. In the comparison, you needn't add "do".

anchoret · 发表于 2003-8-26 15:32:00

助动词尽量补出，不是必须补出。e 应该补do,c、d分别应该补did和have

lemonee · 发表于 2003-8-27 02:28:00

谢谢了！

这里为什么省略了动词？

这里为什么省略了动词？

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