单项选择题

Our plane ______ at six and landed in Beijing ______.

A．takes off, within four hours
B．took off, four hours later
C．rose up, after four hours
D．raised up, in four hours
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单项选择题
______ is forbidden in the meeting-room but we are allowed ______ in the room for smokers.
A．Smoking, smoking
B．Smoking, to smoke
C．To smoke, smoking
D．To smoke, to smoke
单项选择题
The foreigners once ______ their products to our company at a ______ higher price.
A．sent, very
B．lent, still
C．sold, much
D．showed, more
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