单项选择题

The local government warned the citizens ______ water directly from the tap unless it is boiled.

A．do not drink
B．not to drink
C．to not drink
D．not drinking
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单项选择题
A downtown hotel may charge ______ a hotel in the suburb.
A．twice more than

B．twice as much as
C．as twice as

D．more than twice
单项选择题
I hadn’t seen him for years, but I ______ his voice on the telephone.
A．detected
B．realized
C．recognized
D．discovered
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