单项选择题

Many cities in the southern part of the United States have difficulty () traffic flowing when it snows.

A. kept
B. keeping
C. to keep
D. in being kept

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单项选择题
The water is warm enough for us().

A. to go swimming
B. going swimming either
C. to be going swimming
D. go swimming
单项选择题
Little by little, you've tried to () away at my hopes.

A. slice
B. cut
C. tear
D. chip
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