问题补充:
—Why do you look tired?—Because I until 11:50 last night.
A. stayed up
B. stayed away
C. stayed at
D. stay in
答案:
(答案→)A. stayed up
B. stayed away
C. stayed at
D. stay in
解析:stayed up不睡觉,熬夜;stayed away外出,远离;stayed at暂住在……,保留;stay in呆在家,不外出。句意:你为什么看起来很累?——因为昨晚我熬夜到11:50.结合语境可知选A。