摘要：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
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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
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