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Had electronic computers not been invented, many problems on space flight .A.cou

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Had electronic computers not been invented, many problems on space flight .A.cou

Had electronic computers not been invented, many problems on space flight ________.

A.could not have been solved

B.could not be solved

C.can not be solved

D.could not have solved

试题答案

A

虚拟语气的被动语态。

标签：manyinventedonproblemsbeen

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