单项选择题

Don't speak at the same time. ______ please.

A．One at a time
B．On by one time
C．One for each time
D．Each at a time
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He is made ______ 12 hours a day.
A．work
B．to work
C．working
D．worked
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Many a student in my class ______ America.
A．have been to
B．have gone to
C．has been to
D．has gone to
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