—Bob, where is Linda?
—She          be in the library, but I am not sure.
A.must B.may
C.need D.has to
B

試題分析:句意:—鮑勃,琳達(dá)在哪兒?—她可能在圖書館。但是我不確定。此處表推測,根據(jù)答語but I am not sure.說明把握性不大。must一定,很有把握,may可能,把握性較小,need和has to沒有表推測的用法,故選B。
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