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I must find out why____so many students made the same mistake.

A.is it thatB.was it whichC.it is whatD.it was that

D

解析试题分析:考查强调句的特殊问句做宾语从句:句意:我必须弄清楚为什么这么多学生犯同样的错误。why引导的是宾语从句,从句中为强调句型的特殊问句。疑问词why+is it+that…,排除BC,因为是做find out的宾语,从句语序为陈述语序,B排除;所以选D。
考点:考查强调句的特殊问句做宾语从句

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