单项选择题

It is reported that a(n) ______ of accidents has occurred at that intersection.

A．series
B．lot
C．number
D．amount
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单项选择题
Dr. Jones ordered ______ for the laboratory.
A．two pieces of equipments
B．two equipments
C．two pieces of equipment
D．two piece equipments
单项选择题
There is no hurry. You can take your time ______ those exercises.
A．doing
B．to do
C．done
D．to be doing
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