20．The most polluting vehicles        from driving through the city since then．（　�。�
A．are bannedB．ban
C．have been bannedD．have banned

分析 從那時起，對環(huán)境污染最嚴重的車輛禁止從市區(qū)通過．

解答 答案：C 題干中since then表示從過去到現(xiàn)在的時間，是完成時態(tài)的時間狀語；ban與vehicles之間構成動賓關系，要用被動．故選C．

點評 語態(tài)是表達主語和動作的關系，分為主動語態(tài)和被動語態(tài)．主動語態(tài)表示主語和動作構成主謂關系；被動語態(tài)表示主語和動作構成動賓關系．從定義中，可以知道被動語態(tài)使用的前提是動詞必須及物．學習時要注意掌握．

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