Itisn’tclear_____istoblame.Weneedtofindasolutiontotheproblemfirst.A.w

It isn’t clear_____ is to blame.We need to find a solution to the problem first.A.who is it thatB.who it is thatC.it is who thatD.that who it is

B解析试题分析：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。考点：考查主语从句的语序及强调句型的用法点评：把主语从句与强调句型放在一起考查，增加了试题的难度，考生必须这两个知识点都能熟练掌握才行，近几年高考单选考查多个知识点的频率高了。即学即练：_____ you usually go to work?A. How is it that B. How it is that C.it is how that D.that how it is解析：A. 句意：你通常是怎样去上班的？

感谢回答，我学习了