问题
单项选择题
I can't accept your invitation ________I've already had an appointment with my friend.
A．which
B．that
C．in which
D．in that
答案
参考答案：D
解析：我无法接受你的邀请，因为我已经和朋友有约了。本题中的两个句子构成因果关系，in that同because，引导原因状语从句。
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