Since 1970,millions of enthusiasts____Vitamin C,which they b

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Since 1970,millions of enthusiasts____Vitamin C,which they believe can remedy the common cold.
A.have been taken B.have been taking

答案应为B
此句子主语是millions of enthusiasts（数以百万记的热心的人们）,宾语是Vitamin C（维生素C）,谓语动词应选择主动,该动作延续到现在,而且未必停止,所以应选择现在完成进行时态.
如果改成have taken 表明该动作到现在已经完成了,现在大家不服用维生素C了.根据实际情况来看,不太符合.
再问：如果改成have taken 意思变成什么了？是不是也可以？
再答：我把答案改了，您看懂了吗？

Since 1970,millions of enthusiasts____Vitamin C,which they b since 1970,millions of enthusiasts___vitamin C,which they be Since1970,millions of enthusiasts __ Vitamin C,which they be .attracted______ people A millions of B.two millions C two m 3.The millions of calculations involved,had they been done b A million B millions of C three million of D three millions_ There are many places of interest which attract millions of Millions of pounds'worth of damage___by a snowstorm which st millions of millions There are___trees on hill A,four millions B,million of C,mil there are ___stars in the universe.A:millions B:million of C 英语选择提1.Millions of (C )are grazing in the field A deers B o