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【题目】The math problem is so hard. I really don't know________.
A.how to do it
B.how to do
C.what to do it
D.where to do it

【答案】A
【解析】句意:这道数学题太难了。我真的不知道怎么做这道题。how怎样;what什么;where哪里。根据句意排除C和D;how是疑问副词,不可作do的宾语,后面应加宾语it,为how to do it;而what是疑问代词,可以直接作do的宾语,故为what to do。故选A。

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