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

答案A

解析 本题考查非谓语动词。句意:数以百万计的美国人服用维生素和矿物质,他们相信这些药丸可以帮助预防严重的疾病。convinee属于及物动词,后面要跟宾语,一般用法是跟一个直接宾语和一个间接宾语,即convinee sb.0f sth.。此句巾的sh.是mill。ions0f Americans,在句中作主语,所以convinc:e应该用被动形式。故本题选A。
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