______ by a greater demand of vegetables, farmers have built more green houses.
A. Driven B. Being driven C. To drive D. Having driven
It is reported that the floods have left about _________ people homeless.
A. two thousand B. two-thousands C. two thousands D. two thousands of
When you get the paper back, pay special attention to what ________.
A. have marked B. have been marked C. had marked D. had been marked
Students should be encouraged to use ________ Internet as ________ resource.
A. 不填; a B. the; a C. the; the D. 不填; the
____ is known to us all that the old scientist , for ____ life was hard in the past, still works hard in his eighties.
A. It, whom B. As, whom C. As, whose D. What, whom
---I’ll ask the teacher about the attributive clause. I’m very puzzled about it
---That’s just ____ most of our classmates have doubt.
A. What B. Why C. where D. how
