下列说法中,正确的是( )
A:“同旁内角互补”是真命题
B:“同旁内角互补”是假命题
C:“同旁内角互补”不是命题
D:“同旁内角互补,两直线平行”不是命题
A great number of students said they were forced to practise the piano.
下列说法中正确的是( )