单项选择题

The speed at which an animal lives is determined by () the rate at which it uses oxygen.

A. measuring
B. assessing
C. surveying
D. pleasing

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单项选择题
()Jane's glass, I apologized to her.

A. To break
B. Breaking
C. Having broken
D. Break
单项选择题
Helen always comes home at weekends, () the country to the town.

A. prefer
B. to prefer
C. preferring
D. having preferred
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