A.graduated
B.has graduated
C.had been graduating
D.had graduated
【例】 We arrived at work in the morning and found that somebody ________ into the office during the night.
A.broke
B.had broken
C.has broken
D.was breaking
1.过去完成时表示过去某一动作以前已经发生或完成了的动作(即表示“过去的过去”)。时间状语可用by, before等构成的短语,也可用时间状语从句或通过上下文的语境表示。
He said that he had been abroad for three years.
他说他在国外呆了3年。
2.表示动作在过去某一时间之前开始,一直延续到过去的这一时间,而且还可能继续下去的动作,常用的时间状语有:by then, by the end of, by the time, until, before等。
Until then he had known nothing about it yet.
直到那时为止,他对此仍一无所知。
3.用在It was the first/second/third ...time that ...句型中,that从句的谓语要用过去完成时。
This was the first time they had met in thirty-nine years.这是39年里他们第一次见面。
4.It was+一段时间+since从句。since从句的谓语动词用过去完成时。
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