I can't figure out ________ it is that makes him so difficult at school.A．how B．_刷题宝

题干

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

A．how	B．what
C．why	D．which

上一题下一题 0.64难度单项选择更新时间:2014-04-19 09:37:47

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