高等继续教育 / 专科英语I
正确率：100%
题型描述: 单选题
Since 1970, millions of enthusiasts ＿＿＿＿＿＿＿＿ a substance which they believe can cure the common cold ---- Vitamin C.have being taken
B.have been taking
C.have been taken
D.have taken
Since 1970, millions of enthusiasts ＿＿＿＿＿＿＿＿ a substance which they believe can cure the common cold ---- Vitamin C.have being taken
B.have been taking
C.have been taken
D.have taken
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