单项选择题

As soon as we crossed the border, enemy troops started firing at our troops.

A．shooting
B．fighting
C．striking
D．hitting
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单项选择题
The Commission has also begun looking into the role of climate.
A．roll
B．road
C．part
D．character
单项选择题
Our new house is on the first floor.
A．bottom
B．third
C．ground.
D．top
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