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Every possible means ________, but the teacher as well as th

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Every possible means ________, but the teacher as well as the students ________ found a solution to the problem yet.
A.has been tried; hasn’t B.has tried; haven’t
C.have tried; haven’t D.have been tried; hasn’t
Every possible means ________, but the teacher as well as th
A

考查主谓一致。means单复同形,与every修饰,谓语动词用单数;as well as连接两个主语,谓语动词与前一个主语保持一致,故选A。