题目内容

From the ___ expression on her face, we knew that the problem was ____.
A.puzzling….puzzlingB.puzzled…puzzledC.puzzling..puzzledD.puzzled..puzzling
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。
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