You all _______________those calculations! We have a computer to do that sort of thing.
A.must not have done B.needn’t have done C.can not have done D.shouldn’t have done正确答案B
You all _______________those calculations! We have a computer to do that sort of thing.
A.must not have done B.needn’t have done C.can not have done D.shouldn’t have done正确答案B
