【考点6】过去完成时的用法考查
过去完成时表示过去某个行为或某件事发生之前就已经发生的动作或情况。例如：Hepburn had been a model before she became a Hollywood superstar.
【中考链接】
1.Did you see Mr. Chen yesterday afternoon?
No. When I got to school, he_______ already. (2006年扬州)
A. left B. has left C. was leaving D. had left
简析：D。到达学校为过去的动作，在这个行为发生之前陈老师已离开了。过去完成时表示过去的过去。
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