问题
选择题
--It’s said that no one ______ light a cigarette at a gas station.
--- Yes. Safety always comes the first.
A．can
B．may
C．shall
D．must
答案
答案：C
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--It’s said that no one ______ light a cigarette at a gas station.
--- Yes. Safety always comes the first.
A．can
B．may
C．shall
D．must
答案：C