Question

You must ______ your cigarette when you are at the gas station.

A．put down

B．put on

C．put off

D．put out

Answer 1

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。