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I promised to get there before 5 o’clock, but now the rain i

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I promised to get there before 5 o’clock, but now the rain is pouring down. They _______ for me impatiently.                                      
A.may wait B.ought to wait C.could wait D.must be waiting
I promised to get there before 5 o’clock, but now the rain i
D

这题考查情态动词的用法:根据句意:我答应他们5点前到那,但现在雨一直下,他们一定在不耐烦的等我呢。说明一定正在做,用must be doing,选D。