问题补充：
, Nathan gave back the enormous amount of money he found.
A. To his sorrow
B. To his joy
C. To his surprise
D. To his credit
答案：
A. To his sorrow
B. To his joy
C. To his surprise
(答案→)D. To his credit
解析：考查词组辨析：A. To his sorrow使他难过的是，B. To his joy使他高兴的是，C. To his surprise使他惊讶的是，D. To his credit值得赞扬的是，句意是：值得赞扬的是，Nathan归还了他发现的巨款。选D。
