问几题英文的单项选择题...并说明理由

题目

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

答案

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...