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—There's someone knocking on the door.Who        it be?
—It must be Mary.She promised to be here at 8:00.
A.mustB.canC.shall D.need
B

试题分析:句意:--有人在敲门。可能会是谁呢?--一定是Mary。她答应八点钟到这里。A. must一定,表主观肯定推测;B. need需要;C. shall将会是;D. can可能,表示怀疑、猜测、惊异(主要用于否定句或疑问句中)。故选B
考点: 考查情态动词的用法。
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