I didn’t get a pay rise but that wasn’t the right reason I left. A. howB. at whichC. when

问题补充：

I didn’t get a pay rise, but that wasn’t the right reason I left.

A. how

B. at which

C. when

D. for which

答案：

A. how

B. at which

C. when

(答案→)D. for which

解析：考查定语从句。先行词是the right reason，在定从I left中作 原因状语，用for which或why。所以选D。