题目内容
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
B
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题目内容
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
B