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解一道[定语从句]的选择题Idon'tknowthereasonhe'scomesolate.A.forwhichB.whyC.alltheabove

题目详情
解一道[定语从句]的选择题
I don't know the reason _________ he's come so late.
A.for which
B.why
C.all the above
▼优质解答
答案和解析
why =for which
我不知道他来晚的原因.
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