why do you look so tried I didn't do to sleep( )12.00p.m.last night A.before B.after C.at D.until
问题描述：
why do you look so tried I didn't do to sleep( )12.00p.m.last night A.before B.after C.at D.until
答
D.until
你怎么看起来这么累?
我直到12:00才去睡.
didn't ...until 直到才.