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
Young______she is, she knows a lot about the outside world.
A. like
B. as
C. although
D. which
单项选择题
It______you to at least 50% off the regular price of either frames or lenses when you buy both.
A. credits
B. entitles
C. presents
D. tips
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