问题
选择题
It'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
答案：D
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It'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：D