(2013·安徽安庆三模)—She looks very happy.She________have passed the exam. —I guess so.It’s not difficult a...
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题目内容：
(2013·安徽安庆三模)—She looks very happy.She________have passed the exam.
—I guess so.It’s not difficult after all.
A．should B．must
C．could D．might
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