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
Don’t all stand up at one time! ______, please.
A. Each at one time
B. One by one time
C. One at a time
D. One for each time
单项选择题
I saw Bob play the piano at John’s party and on that （）he was simply brilliant.

A. scene
B. circumstance
C. occasion
D. situation
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