说明
the reason that/why/for which
核心问题
Do you know the reason ____ he was late?
A. that B. which C. for that D. for which(《海淀名题·高中英语语法完全解题》，东北师范大学出版社，p.286)
书上给的答案是 D(for which), 难道不能选 A(that) 吗?
词典解答
在以 the reason 为中心词的定语从句中,既可以使用 for which(但比较罕见),也可以使用关系副词 why 或 that(参见 the reason why/that , appositive clause or attributive clause):
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The reason(why) I am going is that I want to. (CLD) 我要去的原因是我想去。
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That wasn't the reason (that) he lied to you. (LEG) 那不是他对你撒谎的原因。
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Is that the reason (that) they came? (CGEL) 这是他们来的原因吗?