Hurry up,Mary _______for us at the station.A.must be waiting B.must wait

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Hurry up,Mary _______for us at the station.A.must be waiting B.must wait

Hurry up,Mary _______for us at the station.A.must be waiting B.must wait
Hurry up,Mary _______for us at the station.A.must be waiting B.must wait

Hurry up,Mary _______for us at the station.A.must be waiting B.must wait
A 一定在等着我们

A

选择A，首先must表示肯定。根据语境要用现在进行时，这是情态动词的现在进行时。

选A
意思是：快一点，玛丽现在一定正在车站等我们。
表示对现在的推测

A.must be waiting 强调“等待”这种持续状态

从语法意思上来说，这两个都是对的。
但是选A会更好。表示正在进行。

A

A
强调现在进行时

A

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