I promised to get there before 5 o’clock

问题选择题

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

答案

答案：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。