单项选择题

Canada will prohibit smoking in all offices later this year.（）

A．remove
B．ban
C．eliminate
D．expel

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单项选择题
Her speciality is heart surgery.（）

A．region
B．site
C．platform
D．field
单项选择题
Customers often defer payment for as long as possible.（）

A．make
B．demand
C．obtain
D．postpone
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