Since 1970, millions of enthusiasts ______ a substance which they believe can remedy the common cold — VitaminC

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问题 Since 1970, millions of enthusiasts ______ a substance which they believe can remedy the common cold — VitaminC

选项 A、have taken
B、have been taking
C、have been taken
D、have being taken

答案B

解析由题干中的Since 1970可知，主句的时态应使用现在完成进行时，故答案为B 。

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专业英语四级

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