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I can't figure out ________ it is that makes him so difficult at school.

Ahow Bwhat

Cwhy Dwhich

 

B

【解析】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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