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    精英家教网 > 高中英语 > 题目详情
    Car rental agencies _______ a boom in business ever since new restrictions made it harder for people to buy an automobile in the capital.
    A．has enjoyedB．have been enjoyingC．are enjoyingD．enjoyed
    B

    试题分析：考察时态。本题的关键在于后面的ever since（自从）引导的时间状语从句，该时间状语常常与现在完成时连用。句意：自从新的限制让首都人民购买汽车变得更加困难，汽车租赁已经有了很快的发展。该句的主语是复数形式，故B正确。
    点评：现在完成进行时表示从过去某个时间开始到现在一直都在发生，都在进行的动作。强调动作的持续性。
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