24.The students were ____ over the ____ problem, listening to the teacher with a ____ expression on their faces.
A. puzzled; puzzling; puzzling B. puzzled; puzzling; puzzled
C. puzzling; puzzling; puzzled D. puzzling; puzzled; puzzling
24.The students were ____ over the ____ problem, listening to the teacher with a ____ expression on their faces.
A. puzzled; puzzling; puzzling B. puzzled; puzzling; puzzled
C. puzzling; puzzling; puzzled D. puzzling; puzzled; puzzling
B