单项选择题

A．Once a week.
B．Once two weeks.
C．Once a month.
D．Once three weeks.
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单项选择题
A．Because they are less harmful.B．Because they cost less.C．Because they taste better.D．Because they last longer.
A．Because they are less harmful.
B．Because they cost less.
C．Because they taste better.
D．Because they last longer.
单项选择题
A．She went to business,B．She stayed in London.C．She stayed in Fendale.D．She stayed in France.
A．She went to business,
B．She stayed in London.
C．She stayed in Fendale.
D．She stayed in France.
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