单项选择题

Even in ancient times, there were ______ of night-watchmen which went about the cities.

A．guards
B．teams
C．routes
D．patrols
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单项选择题
Jack ______ from home for two days now, and I am beginning to worry about his safety.
A．has been missing
B．has been missed
C．had been missing
D．was missed
单项选择题
The board deemed it urgent that these files ______ right away.
A．had to be printed
B．should have been printed
C．must be printed
D．should be printed
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