Question

We had to stay at home ______ it was raining hard.

A．of

B．because

C．because of

D．as

Answer 1

B

解析試題分析：句意：我不得不待在家里，因為下很大的雨。Because因為，后接從句；because of因為，后接名詞性短語；題中后面是個從句，故選B。
考點：考查連詞。