问题标题:
There'ssomeoneoutside.Who___itbe?There'ssomeoneoutside.Who___itbe?ItmustbeMary.Shepromisedtocomehereoverat8:00.A:mustB:canC:shallD:need为什么?
问题描述:

There'ssomeoneoutside.Who___itbe?

There'ssomeoneoutside.Who___itbe?

ItmustbeMary.Shepromisedtocomehereoverat8:00.

A:mustB:canC:shallD:need

为什么?

刘瑞成回答:
  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mustbe是一定的意思.CD选项皆不通
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