Once environmental damage ______, it takes many years for the system to recover.

游客2024-07-21 16

问题 Once environmental damage ______, it takes many years for the system to recover.

选项 A、is done
B、will be done
C、has done
D、is to be done

答案 A

解析

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Onceenvironmentaldamage______,ittakesmanyyearsforthesystemtorecover.