He realized she was crying ________ what he had sad.
A．becauseB．because ofC．a(chǎn)sD．since
B
考查名詞性從句。what he had sad是名詞性從句，而連詞because, as和since
不能引導(dǎo)名詞性從句，所以選B，because of ，介詞of后面引導(dǎo)的是賓語(yǔ)從句。
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