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

A

A

A
left 是接在 have后面``的``

A.
第一个"thing" 应该有个"s"。整句便是如下:
"We have done things we ought not to have done and left undone things we ought to have done."