逗号前是从句,后面是主句
once引导条件状语从句
Once harm is done to the environment,it takes years to have the system recovered.
Once harm is done to the environment,it takes years to have the system recovered.
这是什么从句?哪是从句,哪是主句?
这是什么从句?哪是从句,哪是主句?
英语人气：883 ℃时间：2019-11-04 08:16:56
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