2. 外语
  3. If computers______, many problems on space flight could not have been solved.

If computers______, many problems on space flight could not have been solved.

admin2016-06-30  44
问题 If computers______, many problems on space flight could not have been solved.
选项 A、had not been invented
B、are not invented
C、were not invented
D、have not invented
答案A
解析 译文：如果没有发明计算机的话，太空飞行的许多问题就不可能解决。虚拟语气题。本题考查与过去事实相反的虚拟语气，其结构为“从句：If+主语+had+动词过去分词；主句：主语+should／would／might／would+have+动词过去分词”，故本题选[A]。
转载请注明原文地址:https://kaotiyun.com/show/eHPK777K
0

专业英语四级

相关试题推荐
随机试题
最新回复(0)