题目内容
Laughter, along with an active sense of humor, ______ protect you against a heart attack,according to a recent study.
A. have helped B. helped C. help D. helps
D
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题目内容
Laughter, along with an active sense of humor, ______ protect you against a heart attack,according to a recent study.
A. have helped B. helped C. help D. helps
D
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