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请问这怎么翻译的,thanks怎么选择Had electronic computers not been invente
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请问这怎么翻译的,thanks怎么选择
Had electronic computers not been invented, many problems of space flight ______ now. A. could not have been solved B. could not be solved C. must not be solved D. should not have been solved
请问这怎么翻译的,thanks怎么选择
Had electronic computers not been invented, many problems of space flight ______ now. A. could not have been solved B. could not be solved C. must not be solved D. should not have been solved
Had electronic computers not been invented, many problems of space flight ______ now. A. could not have been solved B. could not be solved C. must not be solved D. should not have been solved
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