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

试题分析:句意:—鲍勃,琳达在哪儿?—她可能在图书馆。但是我不确定。此处表推测,根据答语but I am not sure.说明把握性不大。must一定,很有把握,may可能,把握性较小,need和has to没有表推测的用法,故选B。
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