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
单项选择题
______ in time, the pills will be effective.
A. Taken
B. Taking
C. Take
D. To take
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