单项选择题

The relationship between employers and employees has been studied （）.

A. originally
B. extremely
C. violently
D. intensively

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单项选择题
The firemen are still （） the small fires started by the plane crash.

A. taking off
B. setting aside
C. getting along with
D. putting out
单项选择题
As a gardener, Jim has to water the flowers and （） the grass in the garden every morning.

A. trim
B. improve
C. refine
D. repair
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