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(2013·济南一中模拟)—Where ________ Mary have put the empty bottles?

—She ________ them away. They must be somewhere.

A.can; can't have thrown

B.must; needn't

C.must; must have thrown

D.can; mustn't have thrown

高三英语单项填空中等难度题

少年,再来一题如何?
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