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

问题补充：

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：

A. may wait

B. ought to wait

C. could wait

(答案→)D. must be waiting

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