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單項(xiàng)選擇題

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

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

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單項(xiàng)選擇題

There are many cities（）very fast.

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

單項(xiàng)選擇題

Civil war or regional conflicts also cause disruption,（）people out of rural areas.

A.drives
B.drove
C.driving
D.driven

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