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40. Once harm ______ to the environment, it takes years to have the system recovered.

A. does          B. is done          C. will be done      D. be done

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39. Staying in a hotel in Shanghai one day costs ____ renting a house in my hometown for a week.

A. the three times price of          B. three times the price of

C. as much as three times               D. as much three times as

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