Millions of Americans take vitamins and minerals, ______that these pills can help to prevent serious illnesses.

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问题 Millions of Americans take vitamins and minerals, ______that these pills can help to prevent serious illnesses.

选项 A、convincing
B、convinced
C、to convince
D、to be convinced

答案B

解析分析句子结构可知，主句成分完整，所以空格处应为非谓语动词。convince和主句主语millions of Americans之间为逻辑上的动宾关系，所以要用过去分词形式。故选B。

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