单项选择题

It was not until 1920 () regular radio broadcast began.

A. that
B. while
C. which
D. since

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

A. To break
B. Breaking
C. Having broken
D. Break
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