since 1970,millions of enthusiasts___vitamin C,which they be

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since 1970,millions of enthusiasts___vitamin C,which they believe can remedy the common cold.
A.have taken B.have been taking 为什么A不行呢 A也有动作发生在过去现在还在发生,还有可能持续下去的意思.

虽然说 A 和 B 都可以表示从过去某一时刻开始一直延续到现在的动作,
但 A 在表达这个动作到现在还在持续上并不是肯定的.如果你选A,容易产生动作已停止不再发生的ambiguity(歧义).
而 B 则是非常肯定动作仍在继续.

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