摘要： You promised your friend a letter; you ought to days ago. A. write B. be writing C. have written D. be written
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You promised your friend a letter; you ought to ______ days ago.
A. write B. be writing C. have written D. be written
查看习题详情和答案>>You promised your friend a letter; you ought to ______ days ago.
|
A．write |
B．be writing |
C．have written |
D．be written |
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