【題目】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

【答案】C
【解析】句意：雖然在防治污染方面我們已經(jīng)取得了很大進步，但依然還有許多要做。remain to do這里需要用它的被動式remain to be done，所以答案是C。

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