问题描述：
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
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
问题解答：
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