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    精英家教网 > 高中英语 > 题目详情
    New technology ______ to make sure that the cars, taxis, buses and trains we use ______ the air.
    A．is used; not to polluteB．has used; is not polluted
    C．is being used; do not polluteD．has been used; to pollute
    C

    本题主要考查动词的时态及语态的应用。第 1 空强调目前所正在进行的一种行为。由于主语是动作的承受者，应该使用现在进行时的被动语态；第 2 空强调一般经常性的行为，应该用一般现在时。因此本题的正确答案选C。
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