下列属于复合肥料的是 [ ]

A. KCl

B. KNO₃

C. NH₄NO₃

D.Ca(H₂PO₄)₂

The girl looked at me with a ______expression. Maybe the problem was quite _____.

A．puzzling; puzzling

B．puzzling; puzzled

C．puzzled; puzzled

D．puzzled; puzzling