Since 1970, millions of enthusiasts______a substance which they believe can reme

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问题 Since 1970, millions of enthusiasts______a substance which they believe can remedy the common cold — Vitamin C.

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

答案 B

解析由题千中的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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