I must find out why＿＿＿＿so many students made the same mistakeA.is it thatB.was it whichC.it is whatD.it was that
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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