问题补充：
I have started getting up at 5:30 a.m. to study;I don’t know if I can this.
A. keep;away
B. keep;out
C. keep;up
D. keep;back
答案：
A. keep;away
B. keep;out
(答案→)C. keep;up
D. keep;back
解析：keep up坚持，维持；keep away使某人(某物)不靠近；keep out不进入(某处)，留在外边;keep back阻止，使……不能移动。句意为：为了学习，我已开始早上五点半起床，但我不知道我能否坚持下去。
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