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外语
Had electronic computers not been invented, ______ (很多关于太空飞行的问题不能解决了).
Had electronic computers not been invented, ______ (很多关于太空飞行的问题不能解决了).
admin
2010-02-26
21
问题
Had electronic computers not been invented, ______ (很多关于太空飞行的问题不能解决了).
选项
答案
many problems of space flight could not have been solved
解析
(if从句中的had移到句首后,if省略了,从句中依旧用否定式的could not have been solved;被动语态构成为have been done)
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0
大学英语六级
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