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tom couldn't say what it was_made him so upset.A.that B.who C.what D.which我选B,但答案为A,什么道理?

题目详情
tom couldn't say what it was_made him so upset.
A.that B.who C.what D.which
我选B,但答案为A,什么道理?
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答案和解析
A 这里是强调句式 it was...that
(it was) what (that) made him so upset