单项选择题

______ he can quickly seize the chance of business.

A．Having been well informed
B．To be well informed
C．Having well informed
D．To have been well informed
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单项选择题
Since the redesign of the assembly line, the productivity ______.
A．is improved
B．improves
C．is improving
D．has been improved.
单项选择题
One difficulty has been solved. But another one will ______.
A．arise
B．rise
C．arouse
D．arose
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