You mustyour cigarette when you are at the gas station.A. put downB. put onC. put offD. pu

问题补充：

You mustyour cigarette when you are at the gas station.

A. put down

B. put on

C. put off

D. put out

答案：

A. put down

B. put on

C. put off

(答案→)D. put out

解析：根据动词词组意思可知答案为D符合题意，表示熄灭的意思。