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--Listen! Someone is knocking at the door.
-- ______ be Mary. She has just been to Beijing
A.She mustn’tB.It can’tC.It mustD.She may
C
此题充分体现了一题多考点的命题倾向,考查了情态动词的选择,代词的选择以及隐含语境has been to的用法。
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