Since 1970, millions of enthusiasts ______ a substance which they believe can remedy the common cold — VitaminC

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问题 Since 1970, millions of enthusiasts ______ a substance which they believe can remedy the common cold — VitaminC

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

答案B

解析由题干中的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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专业英语四级

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Since 1970, millions of enthusiasts ______ a substance which they believe can remedy the common cold — VitaminC

专业英语四级

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Everything________intoconsideration,IproposethatthefirstprizeshouldbegiventoLinQiang.

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ScientistshavelongbelievedonewaytostoptheEarth’satmospherefromwarmingisbyplantingmoretrees.Theideaisthatmo

Thereweretwowidelydivergentinfluencesontheearlydevelopmentofstatisticalmethods.Statisticshadamotherwhowasdedi

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复式记账法，是对每一笔经济业务事项都要在（　　）相互联系的账户中进行登记，系统地反映资金运动变化结果的一种记账方法。

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