10、It must be a ______ question, as can be seen from the _______ expression on the physics teacher’s face.

A. puzzled, puzzling                        B. puzzling; puzzled

C. puzzling; puzzling                       D. puzzled; puzzled

10、B

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It must be a ______ question, as can be seen from the _______ expression on the physics teacher’s face.

A. puzzled, puzzling                        B. puzzling; puzzled

C. puzzling; puzzling                       D. puzzled; puzzled

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