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
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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.
单项选择题
______ he can quickly seize the chance of business.
A．Having been well informed
B．Having well informed
C．To be well informed
D．To have been well informed
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