Q9: How many years did Dr. Jones live? (1) If Dr. Jones had become a doctor 10 years earlier than he did, he would have been a doctor for exactly 2/3 of his life. (2) If Dr. Jones had become a doctor 10 years later than he did, he would have been a doctor for exactly 1/3 of his life. ANS: C 可以请教此题列式吗... 我知道答案是c，可是我不太清楚如何列式。脑筋有点转不过来...@@ 请指点迷津，thanks a lot... --

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