he is my son,_____ a better son does not exist.为什么用against whom 而不能用than whom?求赐教!

He is my son,_____ a better son does not exist.A.but B.than who C.against whom D.than whom选择C还是D?为什么? he is my son,_____ a better son does not exist.为什么用against whom 而不能用than whom?求赐教! my aunt‘s son is my _____ my son is ill and he has to see a doctor._____.A.Is it trueB.It doesn't matterC.What a pity!D.Don't worry. He is my son,---------a better son does not exist.(为什么横线上填than whom) He is my grandparents'son,but he isn;t my father.He is my ___.A.fatherB.sonC.grandfatherD.uncle He is my aunt's son .He's my () A.brother B.cousin C.uncle My father is my grandfather's _____.A.son B.daughter C.uncle He has a son.His son is 6 years old.改同义句 He hasHe has a son.His son is 6 years old.改同义句He has a _____ _______.. 93.He is my c__.a son of my aunt.填什么 This is John,my nephew.He is my ()son she is my d( ) and he is my son William is my aunts son.He is my c______. He is my son,_____ a better son does not exist.答案里有than whom和 against whom,给的参考答案是against whom,为什么不是than whom,这里aganist是什么意思 Her son is my brother.She's my _____. He is a teacher ____ _____ son we often like to argue.怎么填 li ping is a good boy.he is like my son. 写出句子中划线单词的对应词.1.He has a son and a____.Son画线的2.Oh,they are my mother and_____.mother画线的3.This is John and_____is Mary4.He is my friend Jack and_____is my sister Nancy.He画线 5.---Are these your pens?---No,_____