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

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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。