There is no reason why you shouldn’t tell the headmaster that you are resigning because h

There is no reason why you shouldn’t tell the headmaster that you are resigning because he has arranged your post.
A. in effect
B. in fact
C. in advance
D. in support

A. in effectB. in fact(答案→)C. in advanceD. in support解析：考查介词短语：A. in effect 实际上，B. in fact事实上C. in advance提前D. in support支持，句意：你没有理由不事先告诉校长你要辞职，因为他已经安排了你的工作。选C。

我也是这个答案