The reason______he failed the exam was______he had not worked hard.

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问题 The reason______he failed the exam was______he had not worked hard.

选项 A、why. . . if
B、why …that
C、that…why
D、why… what

答案B

解析 本题考查定语从句和表语从句。名词reason后的定语从句由why引导,表语从句由that引导,故本题选B。
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