I promised to get there before 5 o’clock, but now the rain is pouring down. They _______ for me impatiently.                                      
A．may waitB．ought to waitC．could waitD．must be waiting
D
這題考查情態(tài)動詞的用法：根據(jù)句意：我答應(yīng)他們5點前到那，但現(xiàn)在雨一直下，他們一定在不耐煩的等我呢。說明一定正在做，用must be doing，選D。
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