【題目】I don't know _________ Can you help me?
A.how to do it.
B.how to do.
C.what to do it.

【答案】A
【解析】句意:我不知道如何做它。你能幫助我嗎?作動詞know的賓語,用疑問詞+to do,what充當動詞的賓語,故C項中的it是多于的。how作為狀語,后面do有賓語,故排除B項。故選A。

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