--Hi, Mike．Any idea where Mary is? --She in the classroom．I saw her there just n
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——Hi, Mike．Any idea where Mary is?
——She ____ in the classroom．I saw her there just now．
A．shall be B．should have been C．must be D．might have been
试题答案
C
解析:
本题考查情态动词。考must对现在情况的推测。