He couldn't say what it was bothered him.A.what B.who C.that D.of which 为什么不可以选择A?为什么?

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He couldn't say what it was bothered him.
A.what B.who C.that D.of which
为什么不可以选择A?为什么?

典型的强调结构作宾语从句的考查.
原句:It was sth that bothered him.对主语进行强调.
What was it that bothered him?对被强调的主语进行提问.
然后在前面加上主句:He couldn't say what it was that bothered him.因为是从句,使用陈述语序.

从句是强调句型

这句话在say后面就是 it was what that bothered him what在这里充当宾语 that引导宾语从句

句意为:他说不清到底是什么困扰着他。答案为C。从what一直到句末是一个宾语从句。这个宾语从句用了一个强调结构:It was...that...。把it was和that去掉就恢复了原来结构。即: He couldn't say what bothered him .