题目内容

I can't figure out ________ it is that makes him so difficult at school.
A．how B．what
C．whyD．which
B
B 考察强调句型和宾语从句的语序。What it be that强调句式中的强调的是主语，首先要排除how,why，又因为预计中的主语是泛指意义，排除which，有范围。故使用what。
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