问题补充：
giving up, he went on with his research,got his PhD and married the girl.
A. Without
B. Except
C. Instead of
D. But for
答案：
A. Without
B. Except
(答案→)C. Instead of
D. But for
解析：句意为“没有放弃，他继续自己的研究……”，without表示伴随方式，instead of表示“代替，而不是，不……而……”，but for表示“要不是，如没有”。
