单项选择题

Smoking has been ______ in any public areas directly outside the building since the new regulations came into effect.

A．prohibit
B．prohibited
C．prohibiting
D．to prohibit
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单项选择题
Many tourists in Naples like to spend time ______ the city's narrow streets and busy markets on their own.
A．explore
B．explored
C．exploring
D．to explore
单项选择题
They still have not ______ out how to set up their new VCR to record programs in advance.
A．left
B．performed
C．figured
D．employed
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