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程
程
资
讯
讯
综
合
合
过去完成进行时
表示动作在过去某一时间之前开始，一直延续到这一过去时间。这个时态必须以一过去的时间为前提。
过去完成进行时的谓语形式：had been+现在分词
I had been looking for it four days before I found it.
The telephone had been ringing for three minutes before it was answered.
It had been raining for two days. The fields were all under water.
At last we got the letter we had been expecting.
1、“How long had you been waiting before Mr. Winter finally arrived？”
“Well， he came at three o’clock， and I _______ the day before.”
A. had waited after B. had been waiting since
C. was waiting from D. had been waiting for
等某人 wait for sb.
for接一段延续的时间，since接过去时间状语或过去时句子。
答案 B
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