1.withhisattention()onthejob,hedidnotevenlookupwhenwecameinAfocusedBfocusingCtofocusDhavingfocused为什么选A不选B2.Thelady()thirtypoorstudentsgotocollegebytheendoflastyear.AhelpedBhadhelpedChashe

　　1.withhisattention()onthejob,hedidnotevenlookupwhenwecamein

　　AfocusedBfocusingCtofocusDhavingfocused

　　为什么选A不选B

　　2.Thelady()thirtypoorstudentsgotocollegebytheendoflastyear.

　　AhelpedBhadhelpedChashelpedDwouldhavehelped

　　为什么选B不选C

　　分析分析.

　　3.()allofthequestionshavebeensettled,youcangoonwithyourwork

　　Aonlyif(除非..才)Beventhough(即使)Cnowthat(既然,由于)Dwhatif(倘使...将会怎样;即使...又有什么要紧)

　　我查了意思.为什么选C不选A