单项选择题

Some people like drinking coffee, for it has______effects.

A．promoting
B．stimulating
C．enhancing
D．encouraging
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单项选择题
Professor Smith, along with his assistants, ______on the project day and night to meet the deadline.
A．work
B．working
C．is working
D．are working
单项选择题
It turned out that the man was an excellent policeman working in New York, ______had contributed a lot to the case.
A．that
B．which
C．who
D．where
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