Question

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

Answer 1

【答案】A
【解析】句意：我不知道如何做它。你能帮助我吗？作动词know的宾语，用疑问词+to do，what充当动词的宾语，故C项中的it是多于的。how作为状语，后面do有宾语，故排除B项。故选A。