问题补充：
From his looks, we can decide that he’s come across problems.
A. puzzling; troubled
B. puzzling; troubling
C. puzzled; troublesome
D. puzzled; troubled
答案：
A. puzzling; troubled
B. puzzling; troubling
(答案→)C. puzzled; troublesome
D. puzzled; troubled
解析：“从他那吃惊的表情，我们断定他遇到了麻烦事。” puzzled吃惊的，puzzling令人吃惊的，troubling 令人烦的，所以答案C。
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