. __________ by a greater demand of vegetables, farmers have built more green houses.

A. Driven       B. Being driven

C. To drive     D. Having driven

A


解析:

A。根據(jù)空格后的by短語可知,空格處應填過去分詞或被動結(jié)構(gòu),因此可排除C和D。從動作的先后關系來看,應該是先受到蔬菜需求的驅(qū)使,菜農(nóng)們后才建起了更多的溫室菜地,所以空格處不能選表示進行意義的選項B,而應選表完成意義的選項A。其實,Driven by…可視為As they are driven by…之省略。

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Last year, a report by a committee of education experts said that a lot of American students cannot write well. The report noted the concerns of business leaders and teachers. The experts said that more students should have to pass a writing test before they can finish high school. They pointed out that major college entrance tests are changing now to include a writing part.
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