They must ______ for us; let’s hurry up.A、waitB、have been waitedC、waitedD、be

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问题 They must ______ for us; let’s hurry up.

选项 A、wait
B、have been waited
C、waited
D、be waiting

答案 D

解析情态动词除了有时和动词的完成式构成谓语，表示“应当，想必已经”外，还可以和动词进行式构成谓语表示“应当正在，想必正在”。

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