单项选择题

We have produced twice as much steel this year（）4 years ago.

A. than we did
B. as did
C. than we have produced
D. as we have produced

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单项选择题
The farmers,（）houses had been destroyed by the serious flood, were given help by the government.

A. who
B. what
C. which
D. whose
单项选择题
Her hair and coat were wet because it（）.

A. would be raining
B. had been raining
C. would have been raining
D. had rained
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