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问题: She married the man______what he had done for her.

A.because
B.because of
C.since
D.as
答案是B,可我记得because of+n. 为什么A不行

解答:

what he had done for her如果是定语从句的话不能用what 所以从句可能是个宾从
既然是宾从 那么旧符合呢个because of+n.搭配 what 引导的从句做of的宾语