He collected information on 1,000 people, whose IQ       when they were ten years old.


  1. A.
    is tested
  2. B.
    has tested
  3. C.
    would test
  4. D.
    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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