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