单项选择题

We'll visit Europe next year （） we have enough money.

A. lest
B. until
C. unless
D. provided

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单项选择题
I'm sorry I can't see you immediately; but if you' d like to take a seat, I'll be with you （）

A. for a moment
B. in a moment
C. for the moment
D. at the moment
单项选择题
The price of beer（）from 50 cents to 4 dollars per liter during the summer season.

A. altered
B. ranged
C. separated
D. differed
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