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1The doctor did what he could ___(save)the boy,but in vain.t

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1The doctor did what he could ___(save)the boy,but in vain.to save
2 Although ___(told)to stop,he kept on working.told 为什么不是having told
3She worked very hard ___still rather poor in health.
Athough she B although she C though Dalthough was C
1. 有省略,实为did what he could (do), 然后再加不定式to save部分做目的状语.
2. told在本句中是过去分词,被动的意义,从句可以复原为Although( he had been )told to stop, 如果用having told,那么told是主动形式的及物动词,需要跟宾语的.
3. 用排除法,although和though在本题里都是连词,A和B中出现了主语she, 那么后面必须跟was, D中出现了was,那么必须得加上主语she, 才合语法规则,不然就干脆省略主语she和系动词was,只保留一个连词,即答案C.