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

考查動詞短語的辨析。put down寫下，put on穿上，put off脫下，put out撲滅，根據語境在加油站必須把香煙熄滅，所以選D。