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In __________ review off 44 studies, American researchers found that men and women who ate six key foods daily cut the risk of __________ heart disease by 76%. _______

A. a; the     B. the; a     C. a; 不填      D. 不填; a

C


解析:

第一空填不定冠词,表示“一次”;第二空不填冠词(或填零冠词),因为此处是表泛指。

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