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________ an hour every day has made a considerable difference to my health.

A．Having walked B．Walk
C．Walking D．Walked

C

解析句意為： 每天步行一小時(shí)對(duì)我的健康很有益。此處為動(dòng)名詞短語(yǔ)作主語(yǔ)，闡述的是一個(gè)事實(shí)，故選C項(xiàng)。

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