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
D
考查時(shí)態(tài)。根據(jù)句意可知這1000人被測(cè)量IQ的動(dòng)作發(fā)生在他收集信息collect information該動(dòng)作之前，故選擇過(guò)去的過(guò)去，即過(guò)去完成時(shí)。
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