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I promised to get there before 5 o'clock,but now the rain is

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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 is
答案D
must be+adj./n./doing表示对现在、当前情况的推测,意为“(现在、此时)一定……”;may do sth.是指“可能做某事”.could do sth.表示“过去能做某事”.根据句意“我答应五点前到那儿,但现在雨正下得很大.他们肯定正在不耐烦地等着我”可知,应用must be waiting.