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
考查時態(tài)。根據(jù)句意可知這1000人被測量IQ的動作發(fā)生在他收集信息collect information該動作之前，故選擇過去的過去，即過去完成時。
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