问几题英文的单项选择题...并说明理由

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问几题英文的单项选择题...并说明理由
It was the third time that I _____ in at his office.
A.have dropped B.had dropped
C.dropped D.was dropping
We _____ about two thousand english words by the end of last term.
A.learn B.have learned
C.had learned D.would learn
My father,who died fifteen years ago,_____very kind to me.
A.is B.was C.had been D.would be
We_____our seats till the party had begun.
A.hadn't found B.didn't find
C.haven't found D.wouldn't find
In the past it _____ people two years to go round the world.
A.had taken B.has taken C.took D.was taking

第一题选B
原因:It is the third/first/second time看到这种句型用完成时

因为题目里是WAS 所以用过去完成时
第2题选C
看到by the end of last term,诸如BY...加时态,一般用过去完成时
第3题选C
died fifteen years ago是过去时,那father在15年之前对你好,是过去的过去,用过完
第4题选A
时态一致
第5题是C
in the past+过去时
in the past+时间 +现在完成时
发现了主要是关于过去完成时时态的问题
这类题看时间状语就行了
累死了

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