单项选择题

--Who's in the classroom
--().

A. No one
B. None
C. Not one
D. Not many ones

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单项选择题
It was not until 1920 () regular radio broadcast began.

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