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單項(xiàng)選擇題

It is not always easy to tell the right（）the wrong.

A.from
B.with
C.than
D.to

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It is high time we（）something to stop road accidents.

A.did
B.are doing
C.will do
D.do

單項(xiàng)選擇題

It is high time that we（）working to take a break.

A.should stop
B.would stop
C.stopped
D.stop