问题
选择题
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
答案：D
考查时态。根据句意可知这1000人被测量IQ的动作发生在他收集信息collect information该动作之前，故选择过去的过去，即过去完成时。