They are always singing songs to _______
题型:选择题
问题:
They are always singing songs to ________ their spirits when they meet with trouble.[ ]
A. keep off
B. keep back
C. keep up
D. keep on
They are always singing songs to ________ their spirits when they meet with trouble.[ ]
A. keep off
B. keep back
C. keep up
D. keep on