单项选择The thing---she was not sure was that she failed in this exam A which B that C about which D in which

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单项选择The thing---she was not sure was that she failed in this exam A which B that C about which D in which

单项选择The thing---she was not sure was that she failed in this exam A which B that C about which D in which
单项选择The thing---she was not sure was that she failed in this exam
A which B that C about which D in which

单项选择The thing---she was not sure was that she failed in this exam A which B that C about which D in which
C
be sure about sth.对某事不确定
which引导的定语从句,需要介词about

A

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