A-A+

Since 1970 millions of enthusiasts ______ a s

2022-08-02 00:01:08 问答库阅读 168 次

问题详情

Since 1970, millions of enthusiasts ______ a substance which they believe can remedy the common cold — VitaminC
A．have taken
B．have been taking
C．have been taken
D．have being taken

参考答案

正确答案：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 。