有关定语从句的几道单选题~1.Doyouknowthatgril____wearingareddress?A.whoseB.whoC.whomD.who's为什么会选D选项,2.Thatisthereason____hegaveusforcarryingouttheplan.A.becauseB.whyC.howD.which3.Thereason____I'writin

　　有关定语从句的几道单选题~

　　1.Doyouknowthatgril____wearingareddress?

　　A.whoseB.whoC.whomD.who's

　　为什么会选D选项,

　　2.Thatisthereason____hegaveusforcarryingouttheplan.

　　A.becauseB.whyC.howD.which

　　3.Thereason____I'writingtoyouistotellyouaboutapartyonSaturday.

　　为什么第三题选择why而第二题就选which,不是有reason就要选why吗?

　　4.Thereasonwhyhewaslatewas____hehadtakenawrongbus.

　　A.becauseB.whetherC.whenD.that

　　这道题又是什么东东?好像是什么系动词后表语从句..