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Experts think we won’t have clean water to drink unless something soon,but much

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Experts think we won’t have clean water to drink unless something soon,but much

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

 

试题答案

B