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23.—Theyaresaidtohavebeenfamiliarwitheachother.—Butthey.Theywereintroducedonlyhoursago.A.maynothavebeenB.couldn’thavebeenC.mustn’thavebee

题目详情

23.   — They are said to have been familiar with each other.

— But they_________. They were introduced only hours ago.

A. may not have been  B. couldn’t have been

C. mustn’t have been  D. needn’t have been

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答案和解析

B