I t’s quite common in Britain to say “Thank you” to the drivers people get off the bus.A.

问题补充：

I t’s quite common in Britain to say “Thank you” to the drivers people get off the bus.

A. after

B. since

C. until

D. when

答案：

A. after

B. since

C. until

(答案→)D. when

解析：本题考查的是，用when 表示的时间状语从句，故选D