Millions of Americans flock to their drugstore to buy vitamins and minerals, ______that these pills can help to prevent serious

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问题 Millions of Americans flock to their drugstore to buy 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 convince一词属于及物动词,后面要求跟宾语。一般的用法是跟一个直接宾语和一个间接宾语,即convince somebody of sth.。此句中的somebody是millions of Americans,在句中作了主语,所以con vince应该用被动语态形式,being convinced和convinced都算对。A项的convincing不是被动语态,而C和D选项的不定式都包含将来时间的概念,在本句话中的用法和意思都不对。
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