The students were ________ over the ________ problem，listening to the teacher with a ________ expression on their faces.
A．puzzled；puzzling；puzzlingB．puzzled；puzzling；puzzled
C．puzzling；puzzling；puzzledD．puzzling；puzzled；puzzling
B
形容詞辨析。Puzzled感到困惑的,通常形容人；puzzling令人困惑的，通常形容事物；expression表情，它與人有關，所以仍然用puzzled修飾。句意：帶著困惑的表情聽老師講課，學生們對于那個令人困惑的問題感覺很困惑。
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