单项选择题

A．She’s been on vacation.
B． She’s been at the grocery store.
C．She’s been on a business trip.
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单项选择题
A．Their billing system has been efficient. B．Their old billing system is outdated.C．He’s unimpressed with the new billing system.
A．Their billing system has been efficient.
B．Their old billing system is outdated.
C．He’s unimpressed with the new billing system.
单项选择题
A．To buy a newspaper. B．To find a chemist. C．To post a letter.
A．To buy a newspaper.
B．To find a chemist.
C．To post a letter.
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