问题
选择题
You must ______ your cigarette when you are at the gas station.
A．put down
B．put on
C．put off
D．put out
答案
答案：D
考查动词短语的辨析。put down写下，put on穿上，put off脱下，put out扑灭，根据语境在加油站必须把香烟熄灭，所以选D。
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