单项选择题


A．install
B．installed
C．installing
D．installs
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单项选择题
It is hard to imagine a large city without policemen, but such was the ______ in London in the early 18th century.
A．condition
B．affair
C．environment
D．situation
单项选择题
A．mediumB．vehicleC．agentD．means
A．medium
B．vehicle
C．agent
D．means
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