When a man’s heart stops ______ , he dies.

A. to beat B. beating C. beat D. beaten

B 【解析】句意: 當(dāng)一個(gè)人的心臟停止跳動(dòng)時(shí)，他就死了。A. to beat不定式，跳動(dòng)；B. beating現(xiàn)在分詞或動(dòng)名詞，跳動(dòng)；C. beat動(dòng)詞，跳動(dòng)；D. beaten過去分詞，跳動(dòng)。stop doing，意為“停止做某事”，表示停止正在做的事情,符合本題語境；stop to do, 意為“停下來做某事”，to do是要做的事情。故選：B。
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