In order to get rid of the habit of smoking, you must set a date ________ you are going to stop.

In order to get rid of the habit of smoking, you must set a date ________ you are going to stop.

A.in which

B.on which

C.from which

D.at which

答案及解析： B

解析：

定语从句关系词的选择方法通常是将先行词置于从句部分，与date搭配的介词多数为on．