问题
选择题
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
答案
A
并列的谓语：have done和have left并列，省略 have．
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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
A
并列的谓语：have done和have left并列，省略 have．