單項(xiàng)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
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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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