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 droppedC.dropped D.was droppingWe _____ about two thousand english words by the end of last term.A.learn B.have learnedC.had learned D.would learnMy father,who died fifteen years ago,_____very kind to me.A.is B.was C.had been D.would beWe_____our seats till the party had begun.A.hadn't found B.didn't find C.haven't found D.wouldn't findIn the past it _____ peop

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