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
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单项选择题
Our life has but a short ______.
A．duration
B．span
C．episode
D．range
单项选择题
I have to go to see my doctor this afternoon. Would you like me to ______ you
A．send
B．escort
C．accompany
D．campaign
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