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Had electronic computers not been invented, many problems on space flight______.
Had electronic computers not been invented, many problems on space flight______.
游客
2024-08-16
50
管理
问题
Had electronic computers not been invented, many problems on space flight______.
选项
A、could not have been solved
B、could not be solved
C、can not be solved
D、could not have solved
答案
A
解析
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