Even though we have made much progress in preventing pollution, yet much _______

题干

Even though we have made much progress in preventing pollution, yet much ________.

A．is remained to do	B．remains being done
C．remains to be done	D．is remained to be done

上一题下一题 0.64难度单项选择更新时间:2017-02-05 03:07:18

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