Running slowly for some three miles every day is proved a good form of exercise.

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问题 Running slowly for some three miles every day is proved a good form of exercise.

选项 A、some
B、is proved
C、form
D、exercise

答案B

解析 应改为proves。prove在这里是不及物动词,意思是;原来(是),证明、证实(是)。如:My advice proved to be wrong.(我的意见被证实是错的。)本句的意思是:“每天慢跑约3英里被证实是一种良好的锻炼方式。”
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