It isn’t clear is to blame.We need to find a solution to the problem first.A. who is it th

It isn’t clear is to blame.We need to find a solution to the problem first.
A. who is it that
B. who it is that
C. it is who that
D. that who it is

A. who is it that(答案→)B. who it is thatC. it is who thatD. that who it is解析：这里It是形式主语，who引导的是真正的主语从句，从句是强调句型，被强调部分是who，因为who是连词必须放在主语从句的句首，又因为主语从句的语序是陈述语气。故选B。温馨提醒：强调句型的结构：it be 被强调部分+ that+其他，判断强调句型的方法是把it be that去掉，整个句子是成立的。

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