单项选择题

A．To ask if you may smoke.
B．To go to special sections for smokers.
C．To smoke before him.
D．To offer him one before you light up a cigarette.
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单项选择题
A．She had to leave for work before Jack.B．She didn’t know Jack’s telephone number.C．Jack had left the house before she called.D．She didn’t know she was supposed to call Jack.
A．She had to leave for work before Jack.
B．She didn’t know Jack’s telephone number.
C．Jack had left the house before she called.
D．She didn’t know she was supposed to call Jack.
填空题
precondition
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