I promised to get there before 5 o’clock, but now the rain is pouring down. They for me i

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

A. may waitB. ought to waitC. could wait(答案→)D. must be waiting解析：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。

感谢回答，我学习了