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From his       looks, we can decide that he’s come across       problems.
A.puzzling; troubled B.puzzling; troubling C.puzzled; troublesomeD.puzzled; troubled
C
“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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