摘要： I don’t know the question. A. how answer B. how to answer C. to answer what D. to answer
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I don’t know ___________ the question.
A. what to answer B. how to answer
C. to answer what D. to answer how
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I don’t know ________ the question．
[ ]
A．what to answer
B．how to answer
C．to answer what
D．to answer how