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【单选题】

I don't know ______________ next.
[ ]

A.
what to do it
B.
how to do it
C.
what I would do it
D.
how I would do it
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参考解析:
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举一反三

【单选题】Could you tell me _______?

A.
whose the pen on the desk belongs to
B.
why spend so much time on games
C.
whether he’ll come back next week
D.
what should I do with the problem