单项选择题

The waiter stood at the comer of the room, waiting to ______ the next course.

A．eat
B．make
C．serve
D．cook
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单项选择题
The United States is ______ the south of Canada and to the east of Japan.
A．to
B．in
C．on
D．at
单项选择题
Since the redesign of the assembly line, the productivity ______.
A．is improved
B．is improving
C．improves
D．has been improved.
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