From the expression on her face, we knew that the problem was .
A. puzzling….puzzling
B. puzzled…puzzled
C. puzzling..puzzled
D. puzzled..puzzling
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A. puzzling….puzzling
B. puzzled…puzzled
C. puzzling..puzzled
(答案→)D. puzzled..puzzling
解析：前空意为：令人感到困惑的。后一空用puzzling说明这个问题本身上使为难的；费解的；令人困惑的。