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She________the opportunity,but unfortunately she just let it go.
A.should have takenB.must have taken
C.needn't have takenD.can't have taken
A
A 考查情态动词+have done。句意:她本该抓住这个机会,但是不幸的是,她让机会溜走了。should have done本该做某事(而事实上并没有做),表示对过去动作的虚拟。must have done一定做了(表示推测);needn't have done本不必做某事(而事实上做了某事);can't have done肯定没做某事(表示推测)。根据句意选A。
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