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單項(xiàng)選擇題

There are many cities（）very fast.

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

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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

單項(xiàng)選擇題

This growth,（）mainly in Southeast Asia and Africa, has dramatic consequences.

A.happens
B.which is happening
C.which happening
D.which happened

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