单项选择题

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

A．A
B．B
C．C
D．D
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单项选择题
A．atB．withC．byD．through
A．at
B．with
C．by
D．through
单项选择题
After (driving) twenty miles, he suddenly (realized) that he (has been) (driving) in a wrong direction.
A．A
B．B
C．C
D．D
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