The teachers hope students can keep a between work and relaxation.
A. promise
B. lead
C. balance
D. diary
网友回答
A. promise
B. lead
(答案→)C. balance
D. diary
解析：C 考察名词辨析。Keep s promise遵守诺言；keep s balance保持平衡；keep a diary记日记；由语境可知：考试希望学生能够在学习和放松之间取得平衡。故C正确。