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(2013·济南一中模拟)—Where ________ Mary have put the empty bottles? —She ________ them away. They must be ...
题目内容：
(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
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