Since 1970, millions of enthusiasts______ a substance which they believe can rem

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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

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Since1970,millionsofenthusiasts______asubstancewhichtheybelievecanrem