I promised to get then 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 【查看更多】

 

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I promised to get then 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

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