The teacher called Tim’s mother what he had done in the test.
A. because of
B. because
C. since
D. as
网友回答
(答案→)A. because of
B. because
C. since
D. 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。