单项选择题

______ there is little we can do to modify the weather, we can at least know what kind of weather to expect.

A. Since



B. When
C. While



D. Unless
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单项选择题
The house rent is expensive. I've got about half the space I had at home and I'm paying
A. as three times much


B. as much three times
C. much as three times



D. three times as much
单项选择题
She has three students in this speech contest, and all ______ won the first prize.
A. of which



B. of whom
C. them
D. that
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