单项选择题

Next month they （）in the country for eight years.

A. will have been
B. will be
C. are
D. have been

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（）I was talking to Barbara, I learned that Tony was in hospital.

A. Unless
B. While
C. Since
D. Once
单项选择题
This light bulb doesn't work. Can you （）it by another one

A. substitute
B. replace
C. change
D. exchange
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