用be to do sth．和 be about to do sth．填空 (1)I leave when someone knocked at the doo
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用be to do sth．和 be about to do sth．填空
(1)I ________ leave when someone knocked at the door．
(2)We ________ start for Hong Kong tomorrow．
(3)You ________ start for Shanghai at once．
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答案：
解析：(1)was about to (2)are to (3)are to |