大家帮忙看一道英语题Experts think we won’t have clean water to drink unless something ___soon,but much remains____ about environment protection.A、would be done;doing B、is done;to be done C、will be done;to do D、is don

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大家帮忙看一道英语题Experts think we won’t have clean water to drink unless something ___soon,but much remains____ about environment protection.A、would be done;doing B、is done;to be done C、will be done;to do D、is don

大家帮忙看一道英语题Experts think we won’t have clean water to drink unless something ___soon,but much remains____ about environment protection.A、would be done;doing B、is done;to be done C、will be done;to do D、is don
大家帮忙看一道英语题
Experts think we won’t have clean water to drink unless something ___soon,but much remains____ about environment protection.
A、would be done;doing B、is done;to be done
C、will be done;to do D、is done;to do
选哪个啊,记得给出解释 啊

大家帮忙看一道英语题Experts think we won’t have clean water to drink unless something ___soon,but much remains____ about environment protection.A、would be done;doing B、is done;to be done C、will be done;to do D、is don
选B
第一空条件状语从句,
第二空remainto be done 固定搭配
to do 表示要去做,而且是被完成 ,所以是to be done

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