The teacher called Tim’s mother what he had done in the test.A. because ofB. becauseC. si

The teacher called Tim’s mother what he had done in the test.
A. because of
B. because
C. since
D. as

(答案→)A. because ofB. becauseC. sinceD. as解析：考查近义词的用法辨析。本题四选项都可表原因。because，since 和as虽然都表可以表原因，但是它们是从属连词，后面接原因状语从句，故不能选。而because of是介词短语，后面要接宾语。what he had done是一个宾语从句作宾语，故选because of。句意：老师因为Tim在考试中的表现打电话给他的母亲。

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