单项选择题

We should keep ourselves（）of the latest developments.

A．informing
B．informed
C．to inform
D．inform

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单项选择题
Since the introduction of the new technique, the production cost（）greatly.

A．reduces
B．has been reduced
C．is reducing
D．is reduced
单项选择题
We got down to business as soon as we（）each other.

A．had introduced to
B．had been introduced to
C．had introduced by
D．had been introduced by
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