OG 46 and 47--concerning on omiting

ca3ltoys · 发表于 2004-1-9 07:53:00

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 again weight quicker than do those raised in confinement.
(E) associate with other calves, they require less medication and gain weight more quickly than

As for answer E,the best answer, why omit "do" after "than"?

47. Displays of the aurora borealis, or "northern lights," can heat the atmosphere over the arctic enough to affect the trajectories of ballistic missiles, induce electric currents that can cause blackouts in some areas and corrosion in north-south pipelines.
(E) to affect the trajectories of ballistic missiles and induce

As for answer E, the best answer, why omit " to " before "induce"?

I wondered when I should omit something, and when I can, please help me!!!

ca3ltoys · 发表于 2004-1-10 06:43:00

weichenli · 发表于 2005-10-13 23:53:00

是不是to 当不定式的时候可以省略阿？

OG 55 题也是这样

但当介词时就不能了---og 54

namisun · 发表于 2005-10-14 02:18:00

47题，因为是平行结构，所以第二个to可以省略，to do ....and(to)do

46题，偶认为是比较结构中的宾语比较，不需要再加助动词do，建议你看一下论坛上有人发的比较之疱丁解牛，那里面讲得比我清楚。

weichenli · 发表于 2005-10-21 20:02:00

thank namisun , i'll do the serach right now!

OG 46 and 47--concerning on omiting

OG 46 and 47--concerning on omiting

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