◎ 题干
The effect that the medicine _____ on him _____ found out.

A. have; has
B. has; have
C. has; is
D. had; has been
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“The effect that the medicine _____ on him _____ found out. [ ]A. have; has B. has; have C. has; is D. had; has been …”主要考查了你对  【动词的过去式】【现在完成时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。