We have done things we ought not to have done and undone things we ought to have done.A.

发布时间：2020-08-15 02:12:40

We have done things we ought not to have done and      undone things we ought to have done.
A. left
B. leave
C. will leave
D. leaving

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(答案→)A. left
B. leave
C. will leave
D. leaving
解析：并列的谓语：have done和have left并列，省略 have．
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