单项选择题

A．Patrolling the streets.
B．Doing undercover work.
C．Doing detective work.
D．Supervising investigations.
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单项选择题
A．He would like to take Front Street.B．The radio announcer is always telling lies.C．The traffic in Front Street may be busy.D．They should trust the radio announcer.
A．He would like to take Front Street.
B．The radio announcer is always telling lies.
C．The traffic in Front Street may be busy.
D．They should trust the radio announcer.
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