Only when___________ according to the directions can the medicine be quite effectiv...
2022-11-28 17:36:32 187次 2013-2014学年湖南省长沙市高三上学期第四次月考英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Only when___________ according to the directions can the medicine be quite effective.
A. taking B. taken C. being taken D. having been taken
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