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4.We have done things we ought not to have done and_____ und

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4.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 选一个
4.We have done things we ought not to have done and_____ und
选 A
left与done是并列谓语.其它选项不适合并列谓语
意思是“我们做了一些我们不应该做的事情,并且剩下(留下)一些该做而未做的事情.”