Each time __ they met ,they would lalk long hours together.A.during B.which C.where D.\选哪个呢?为什么?

Each time __ they met ,they would lalk long hours together.
A.during B.which C.where D.\
选哪个呢?为什么?

选D
名词短语作时间状语,修饰met
因为这一句中先行词是Each time,在定语从句中作时间状语,即在从句中they 是主语,met是谓语,那么Each time就是作时间状语了