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Had electronic computers not been invented, many problems of

时间:2021-12-02 15:58来源:未知作者:admin 点击: 次

3：Had electronic computers not been invented, many problems of space flight ___________. A：could not have been solved B：could not be solved C：cannot be solved D：could not have solved

3：Had electronic computers not been invented, many problems of space flight ___________.

A：could not have been solved

B：could not be solved

C：cannot be solved

D：could not have solved

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Had electronic computers not been invented, many problems of

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