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

游客2023-11-10 48

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。

转载请注明原文地址:http://tihaiku.com/zcyy/3174009.html

相关试题推荐

随机试题

最新回复(0)

Allsubstances,________,liquidorsolid,aremadeupofatoms.A、betheygases