题目内容

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.

答案:
解析:

  (1)was about to

  (2)are to

  (3)are to


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