单项选择题

We should start (at once) and not waste (too) much time (to argue) (about the) procedure.

A．at once
B．too
C．to argue
D．about the
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单项选择题
Once (giving) (a set of) instructions, a computer can gather (a wide ranger) of informa-tion (for different purposes).
A．giving
B．a set of
C．a wide ranger
D．for different purposes
单项选择题
After (driving) twenty miles, he suddenly (realized) that he (has been driving) (in) a wrong direction.
A．driving
B．realized
C．has been driving
D．in
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