Once harm is _______ to the eco-system, all species will ________, including man himself.
A. made; be in danger B. done; be dangerous
C. caused; be endangered D. done; be in danger
科目：高中英語 來源： 題型：
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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科目：高中英語 來源： 題型：
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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科目：高中英語 來源： 題型：
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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科目：高中英語 來源：2010年上海市虹口區高三下學期質量監控考試（英語） 題型：單選題
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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