单项选择题

Scientists should be kept（）of the latest achievements in their research areas.

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

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单项选择题
The scientists wanted to keep people（）about the breakthrough in their experiment.

A. inform
B. informed
C. informing
D. to inform
单项选择题
The message（）Mr. Black was elected chairman of the committee arrived just in time.

A. which
B. what
C. that
D. how
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