大家帮忙看一道英语题Experts think we won’t have clean water to drink u
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