单选题—I’m sorry, but there’s no smoking on this flight. —Oh, I ______ that. Sorry, I won’t again.A don’t knowB didn’t knowC won’t knowD haven’t known
题目
单选题
—I’m sorry, but there’s no smoking on this flight. —Oh, I ______ that. Sorry, I won’t again.
A
don’t know
B
didn’t know
C
won’t know
D
haven’t known