单项选择题

Three ______ four people believe that having healthy teeth is very important.

A. by
B. from
C. out of
D. of
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单项选择题
She's already got her air ticket and will go to Canada ______.
A. little by little
B. bit by bit
C. by and by
D. step by step
单项选择题
John was later for the business meeting because his flight had been ______ by a heavy storm.
A. kept
B. stopped
C. slowed
D. delayed
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