问题补充：
We had to stay at home it was raining hard.
A. of
B. because
C. because of
D. as
答案：
A. of
(答案→)B. because
C. because of
D. as
解析：句意：我不得不待在家里，因为下很大的雨。Because因为，后接从句；because of因为，后接名词性短语；题中后面是个从句，故选B。
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