单项选择题

You will be there before 9, _______ you don't waste time.

A. provided
B. unless
C. though
D. until
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Even if they are on sale, these refrigerators are equal in price to, if not more expensive than,________ at the other store.
A. anyone
B. the other
C. that
D. the ones
单项选择题
When things get difficult, you just have to grit your teeth and persevere _______ your goals.
A. in
B. on
C. with
D. for
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