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问一道英语单选if anyone ever asks her how old she is,she always ans

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问一道英语单选
if anyone ever asks her how old she is,she always answers ,"my dear ,it must be terrible
A.grown up B.being grown up C.be grown up D.to be grown up
问一道英语单选if anyone ever asks her how old she is,she always ans
选D
理由 前面有it作形式主语,后面必须有不定式或主语从句作真正主语
eg it is difficult to study English by yourself
it seems hard that you study English well in such a short time.
供参考.
再问: 那是不是只要有形式主语,后面真正的主语就一定要用to do 或从句
再答: 如果it作形式主语,句子的真正主语可以是不定式、动名词或从句