Cells either divide too fast or at the wrong time, ________ difficult for the body to function ________.A.making it; properlyB.make it; properC.making that; properD.make that; properly
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A解析现在分词作伴随状语，而且it是形式宾语，真正的宾语是for the body to function，所以用making it；function作为动词，修饰语应用副词，所以用properly。