Each time they met they would talk long hours together.A. whichB. whenC. duringD. \

问题补充：

Each time they met, they would talk long hours together.

A. which

B. when

C. during

D. \

答案：

A. which

B. when

C. during

(答案→)D. \

解析：考查连词。句意：每次他们见面的时候，他们会在一起谈好长一段时间。Each time 每次，引导时间状语从句，本身就是连词不需要再加连词，所以选D。