2. 外语
  3. Had electronic computers not been invented, many problems on space flight______.

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

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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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本试题收录于： C类竞赛（非英语专业本科）题库大学生英语竞赛（NECCS）分类
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C类竞赛（非英语专业本科）

大学生英语竞赛（NECCS）

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