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 Idon’tknowwhoinvented

问题详情:

 Idon’tknowwhoinvented

 I don’t know who invented ______ compass, but I think it is ______ most useful invention.

A. the, the             B. the, a              C. a, the                      D. a, a

【回答】

B

知识点:冠词

题型:选择题

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