Had electronic computers not been invented, ______ (很多关于太空飞行的问题不能解决了). many prob

游客2023-09-14 49

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)

转载请注明原文地址:https://tihaiku.com/zcyy/3012103.html

相关试题推荐

随机试题

最新回复(0)

Weshould______(关心年轻一代的教育问题).beconcernedabouteducationoftheyouthgenera