题目内容

【C6】

A. to
B. in
C. up to
D. until

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A. origin
B. capacity
C. potential
D. source

A. outset
B. output
C. outlet
D. outcome

A. ratio
B. proportion
C. rate
D. percentage

A. To let in the sunshine.
B. To serve as its door.
C. To keep the nest cool.
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