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________ an hour every day has made a considerable difference to my health.
A．Having walkedB．WalkC．WalkingD．Walked
C

試題分析：考查非謂語動詞。分析句子結構可知，本句話缺少主語，只有v.­ing短語可以作主語，故可排除B、D；且“每天走路一小時”是一種經常性的動作，故排除A。句意：每天步行一小時極大地改善了我的健康(狀況)。故C正確。
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