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    精英家教网 > 高中英语 > 题目详情
    Laughter, along with an active sense of humor, ______ protect you against a heart attack, according to a recent study.
    A．have helpedB．helpedC．helpD．helps
    D

    试题分析：本句的主语是laughter，和后面的an active sense of humor没关系，故谓语动词使用单数形式。句义：根据最近的一项调查，笑声和幽默感可以帮助保护我们不受心脏病的攻击。本句中没有出现过去时的时间状语，而且是对经常性的事情的说明，故D正确。
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