【題目】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：這道數(shù)學題太難了。我真的不知道怎么做這道題。how怎樣；what什么；where哪里。根據(jù)句意排除C和D；how是疑問副詞，不可作do的賓語，后面應加賓語it，為how to do it；而what是疑問代詞，可以直接作do的賓語，故為what to do。故選A。

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