题目内容

(2013·德州期末校际联考)________ an hour every day has made a considerable difference to my health.
A．Having walked　　B．Walk
C．Walking　　D．Walked
C
句意：每天步行一小时极大地改善了我的健康(状况)。分析句子结构可知，本句话缺少主语，只有v.­ing短语可以作主语，故可排除B、D；且“每天走路一小时”是一种经常性的动作，故排除A。C项正确。
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