I don't know how_______commas.[ ]A. useB.to useC.usedD.using-初中英语-n多题

◎ 题干

I don't know how_______commas.

[ ]

A. use
B.  to use
C.  used
D.  using

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◎ 解析

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◎ 知识点

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与“I don't know how_______commas.[ ]A. useB.to useC.usedD.using”考查相似的试题有：

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