问几题英文的单项选择题...并说明理由
ItwasthethirdtimethatI_____inathisoffice.
A.havedroppedB.haddropped
C.droppedD.wasdropping
We_____abouttwothousandenglishwordsbytheendoflastterm.
A.learnB.havelearned
C.hadlearnedD.wouldlearn
Myfather,whodiedfifteenyearsago,_____verykindtome.
A.isB.wasC.hadbeenD.wouldbe
We_____ourseatstillthepartyhadbegun.
A.hadn'tfoundB.didn'tfind
C.haven'tfoundD.wouldn'tfind
Inthepastit_____peopletwoyearstogoroundtheworld.
A.hadtakenB.hastakenC.tookD.wastaking