◎ 题干
He collected information on 1,000 people, whose IQ ________ when they were ten years old.
[     ]
A. is tested  
B. has tested
C. would test  
D. had been tested
◎ 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“He collected information on 1,000 people, whose IQ ________ when they were ten years old.[ ]A. is testedB. has testedC. would testD. had been tested…”主要考查了你对  【过去完成时的被动语态】  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。