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

A. is remained to doB. remains being done

C. remains to be doneD. is remained to be done

【答案】C

【解析】

試題分析：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，故選C。

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