单项选择题

The group of technicians are engaged in a study which ______. all aspects of urban planning.

A．inserts
B．grips
C．performs
D．embraces
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单项选择题
She keeps a supply of candles in the house in case of power______.
A．failure
B．lack
C．absence
D．drop
单项选择题
At yesterday's party, Elizabeth's boyfriend amused us by ______ Charlie Chaplin.
A．copying
B．following
C．imitating
D．modeling
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