We had to stay at home a heavy rain.A. forB. sinceC. becauseD. because of

问题补充：

We had to stay at home a heavy rain.

A. for

B. since

C. because

D. because of

答案：

A. for

B. since

C. because

(答案→)D. because of

解析：连词辨析。since和because后面通常接句子表示原因。For后面接名词或者名词短语表示解释说明。Because of后面接名词或者名词短语表示原因。句意：因为大雨，你最好待在家里。