The question is so ________ that there was ________ expression on the students' faces．A.puzzled; puzzlingB.puzzled; puzzledC.puzzling; puzzledD.puzzling; puzzling
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C解析puzzling令人困惑的；puzzled(人)困惑的；puzzled expression困惑的表情。句意为：这道题太令人困惑了，学生们的脸上露出了困惑的表情，故选C。