It was it was raining so hard that we had to stay at home all day.A. sinceB. forC. asD. b

问题补充：

It was it was raining so hard that we had to stay at home all day.

A. since

B. for

C. as

D. because

答案：

A. since

B. for

C. as

(答案→)D. because

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