单项选择题

The robber had escaped and was nowhere to be found when the police ______.

A．arrived
B．had arrived
C．arrive
D．have arrived
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单项选择题
______, the pay isn't attractive enough, though the job itself is quite interesting.
A．Generally speaking
B．On the country
C．In particular
D．To be honest
单项选择题
While watching television, ______.
A．the doorbell rang
B．the doorbell rings
C．we heard the doorbell ring
D．we heard the doorbell rings
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