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 语态错误,应改为proves。prove(to be)sth./adj./that. . . “被证明…”,本身包含被动的意思,所以通常不用be proved。
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