问题
选择题
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
答案
答案：C
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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
答案：C