There's someone outside.Who ___it be?There's someone outside.Who ___it be?It must be Mary.She promised to come here over at 8:00.A:must B:can C:shall D:need为什么?

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There's someone outside.Who ___it be?There's someone outside.Who ___it be?It must be Mary.She promised to come here over at 8:00.A:must B:can C:shall D:need为什么?

There's someone outside.Who ___it be?There's someone outside.Who ___it be?It must be Mary.She promised to come here over at 8:00.A:must B:can C:shall D:need为什么?
There's someone outside.Who ___it be?
There's someone outside.Who ___it be?
It must be Mary.She promised to come here over at 8:00.
A:must B:can C:shall D:need
为什么?

There's someone outside.Who ___it be?There's someone outside.Who ___it be?It must be Mary.She promised to come here over at 8:00.A:must B:can C:shall D:need为什么?
选B,因为根据句意,“有人在外面,它可能是谁?”,表示说话人的猜测,不肯定,所以用“可能”,故选B.而must be 是一定的意思.CD选项皆不通