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Since 1970, millions of enthusiasts ______ a substance which they believe can re
Since 1970, millions of enthusiasts ______ a substance which they believe can re
游客
2023-11-10
7
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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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