单项选择题
As you can see, the number of electronic eyes on our roads ______ rising these days.
A. was keeping
B. keep
C. keeps
D. were keeping
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单项选择题
Some people in parts of the world are wasting food ______ some others haven't any.
A. since
B. when
C. as
D. while
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单项选择题
She went to the bookstore and bought ______.
A. dozen books
B. dozens books
C. dozen of books
D. dozens of books
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