牛津英语高一模块1有关定语从句的几个问题请教!
1Thereason_____hewasdismissedisnotdifficulttoexplian.
AthatBforwhichCwhichDforthat
2Thereason_____shegaveupteachingwasherseriousillness.
AforthatBforwhichCwhichDwhy
3TheEnglishsubject,___idowell,isimportantinmiddleschool.
AwhichBthatCinwhichDatwhich
4TheEnglishsubject,___ihavemasteredwell,isimportantinmiddleschool.
A/BatwhichCthatDinwhich