You promised your friend a letter; you ought to days ago.A. writeB. be writingC. have wri

发布时间：2020-08-16 07:47:45

You promised your friend a letter; you ought to      days ago.
A. write
B. be writing
C. have written
D. be written

网友回答

A. write
B. be writing
(答案→)C. have written
D. be written
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