单项选择题

You''d better _______ the water until it has been boiled.

A．not to drink
B．not drink
C．not drunk
D．not drinking
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单项选择题
For your own_________, please fasten your belts before the plane takes off.
A．safeguard
B．save
C．safety
D．safener
单项选择题
This novel is worth reading, because it gives a detailed description of the historical _______ in 1949.
A．accidents
B．cases
C．events
D．things
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