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單項選擇題

It's one of the best（）I have ever been to.

A.concerts
B.a concert
C.the concert
D.concert

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單項選擇題

Such changes can alter the social structure,（）people to move.

A.which leading
B.leads
C.which led
D.leading

單項選擇題

There are many cities（）very fast.

A.expanding
B.expands
C.expanded
D.expand