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The reason he is unhappy is he has failed the exam.A.which; becauseB.for that; thatC.why; thatD.for;

编辑:chaxungu时间:2026-04-24 12:57:38分类:高中英语题库

The reason ________ he is unhappy is ________ he has failed the exam.
A.which; becauseB.for that; thatC.why; thatD.for; because在线课程C
前一个空用why引导定语从句,先行词是reason;后一个空用that引导表语从句,说明主语the reason的内容.