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

試題分析：考查強(qiáng)調(diào)句的特殊問句做賓語從句：句意：我必須弄清楚為什么這么多學(xué)生犯同樣的錯誤。why引導(dǎo)的是賓語從句，從句中為強(qiáng)調(diào)句型的特殊問句。疑問詞why+is it+that…，排除BC，因為是做find out的賓語，從句語序為陳述語序，B排除；所以選D。
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