选择什么写明原因I don’t know________A.what happened to them.B.what h

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选择什么写明原因
I don’t know________
A.what happened to them.
B.what happened them to
C.what is wrong with them.
D.what the wrong is with them

A和C都可以.
英语中的“某人发生了某事”应该表达为sth happens t sb.,排除B；
宾语从句中必须用陈述语序,排除D.
再问：可不可以这么说，就是what happens to sb和what's wrong with sb已经是陈述结构，不需要再变化？那么what's the matter with sb是陈述结构么？
再答： what happens to sb和what's wrong with sb以及what's the matter with sb都是陈述结构

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