1.因為后面的做限定作用 前面的無需限定
前句中用“a” 后句的對“a”的限制才有意義
2.for可以引導原因2請具體分析一下句子，謝謝分析結(jié)構(gòu)嗎 可是沒有for啊對不起，題錯了，是for whichshe had an ambition to be an artist at an early age,(for wihch)she made every to become better and better。她在年輕的時候曾立志成為一名藝術(shù)家，她因此將一切做得越來越好，先行詞是ambition。ambition放在從句中什么地方？for(the ambition) she made every to become better and better=（the amition) why she made every to become better and better