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--- Hi, Lucy.Do you know where Linda is?

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--- Hi, Lucy.Do you know where Linda is?
--- She            in the library.I saw her there just a few minutes ago.
A.shall be B.must be
C.should have been D.might have been
--- Hi, Lucy.Do you know where Linda is?
B

考查情态动词must表推测的用法。must + do表示对现在事情的推测。所以选B。