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【题目】The physics problem is so hard.I really don’t know .

A. what to do it B. how to do it

C. what do it D. how to do

【答案】B

【解析】

句意“这个物理题太难了,我真的不知道怎么做”。本题考查“疑问词+to do”作宾语,排除C。what是疑问代词,作do的宾语,排除A。how为疑问副词,D项缺少宾语,故选B。

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