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【題目】Once environmental damage ___________, it takes many years for the system to recover.

A. has done B. is to do

C. does D. is done

【答案】D

【解析】考查被動語態(tài)。句意：環(huán)境一旦受損，系統(tǒng)要多年才能修復。來自do damage to.=damage is done to.

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