Since 1970, millions of enthusiasts ______ a substance which they believe can re

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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

解析语法结构题。本句的关键点是：与since引导的时间状语相呼应，主句动词使用现在完成进行时。本句的意思是：1970年以来，数百万狂热者一直在服用一种他们认为能治感冒的物质——维生素C。

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