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He became a famous writer when he was___

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He became a famous writer when he was___
选项:A.in his fifty B.in his fifities c.in fifty years old D.in fifties
B,咱用排除法
A:fifty不能当名词- his fifty就不对啦
C:fifty years old是名词 但是没说谁的啊 your-her还是my?划掉~
D:同C fifties是名词 但是不知道谁啊
这样再来看B>恩his指代有了 fifties也是名词~bingo~
所以说英文还是蛮注重指代明确的 你下次看这个先找主谓宾 1.宾是不是名词?2.代词有吗?指对了吗?