Since1970,millions of enthusiasts __ Vitamin C,which they believe can remedy the common cold.(A have been taken B have been taking)

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Since1970,millions of enthusiasts __ Vitamin C,which they believe can remedy the common cold.(A have been taken B have been taking)
Since1970,millions of enthusiasts __ Vitamin C,which they believe can remedy the common cold.(A have been taken B have been taking

Since1970,millions of enthusiasts __ Vitamin C,which they believe can remedy the common cold.(A have been taken B have been taking)
b