【几道英语单选题,谁能给我解释一下选项的原因~Icouldn'thelpher_A___theheavybagforLucy,asIwastootiredatthattime.AcarryingBcarryCwithcarryingDbeingcarried(为什么不选B)Thegirlisluckyenoughtohavemanype】

　　几道英语单选题,谁能给我解释一下选项的原因~

　　Icouldn'thelpher_A___theheavybagforLucy,asIwastootiredatthattime.

　　AcarryingBcarryCwithcarryingDbeingcarried(为什么不选B)

　　Thegirlisluckyenoughtohavemanypeople__A_herwiththework.

　　AhelpBtohelpChelpedDhelping(为什么不选B)

　　I'llgetmysecretary_B__theletter.

　　AcopyBtocopyCcopiesDcopied(为什么不选A)

　　Whoseturn_A__ondutytoday?

　　AitwillbeBisittobeCisDwillbe

　　Ifyou_D__keepoutoftrouble,youmuststudyharder.

　　AwantBwillbeCaregoingtoDareto(为什么不选C)

　　ThelightA__wentout,soshehadtogotobed.

　　AwentoutBhasgoneoutCturnedoffDhadgone

　　打错了第四题选B