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單項選擇題

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

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

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Cycling is a good exercise.（）, it doesn't pollute the air.

A.Therefore
B.However
C.Moreover
D.But

單項選擇題

They were asked to avoid（）any water which had not been boiled.

A.drinking
B.not to be drunk
C.to drink
D.having

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