题目列表(包括答案和解析)
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
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
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 |
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
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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