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單項選擇題

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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單項選擇題

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

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

單項選擇題

Sixty million people who（）in rural areas are moving to cities every year.

A.lived
B.lives
C.living
D.live