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
It is high time that we ______ all ready for this afternoon meeting, ______ it would be late.
A．must get, or
B．got, or
C．should get, and
D．get, and
单项选择题
He has never seen the Greens and he knows ______ about them.
A．little
B．a little
C．something
D．anything
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