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(shí)起，對(duì)環(huán)境污染最嚴(yán)重的車輛禁止從市區(qū)通過(guò)．

解答 答案：C 題干中since then表示從過(guò)去到現(xiàn)在的時(shí)間，是完成時(shí)態(tài)的時(shí)間狀語(yǔ)；ban與vehicles之間構(gòu)成動(dòng)賓關(guān)系，要用被動(dòng)．故選C．

點(diǎn)評(píng) 語(yǔ)態(tài)是表達(dá)主語(yǔ)和動(dòng)作的關(guān)系，分為主動(dòng)語(yǔ)態(tài)和被動(dòng)語(yǔ)態(tài)．主動(dòng)語(yǔ)態(tài)表示主語(yǔ)和動(dòng)作構(gòu)成主謂關(guān)系；被動(dòng)語(yǔ)態(tài)表示主語(yǔ)和動(dòng)作構(gòu)成動(dòng)賓關(guān)系．從定義中，可以知道被動(dòng)語(yǔ)態(tài)使用的前提是動(dòng)詞必須及物．學(xué)習(xí)時(shí)要注意掌握．

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