问题
选择题
From the ___ expression on her face, we knew that the problem was ____.
A．puzzling….puzzling
B．puzzled…puzzled
C．puzzling..puzzled
D．puzzled..puzzling
答案
答案：D
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。