问题补充:
—Don’t so often. It’s bad for your health.
—I have to. But I know I should have enough sleep.
A. get up
B. stay up
C. look up
D. come up
答案:
A. get up
(答案→)B. stay up
C. look up
D. come up
解析:句意:不要经常熬夜,这样对你的健康不利。所给选项中get up是起床的意思,stay up是熬夜的意思,look up是向上看或查找的意思,come up是出现的意思,根据题意只能选B。