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

試題分析：本句的主語是laughter，和后面的an active sense of humor沒關(guān)系，故謂語動詞使用單數(shù)形式。句義：根據(jù)最近的一項調(diào)查，笑聲和幽默感可以幫助保護我們不受心臟病的攻擊。本句中沒有出現(xiàn)過去時的時間狀語，而且是對經(jīng)常性的事情的說明，故D正確。
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