excuse me,but i don't think you can somke here.Really sorry.i ___ this is a
问题描述:
excuse me,but i don't think you can somke here.Really sorry.i ___ this is a
non-smoking room.A.don't know B.didn't know C.haven't known
选B 但是this is 时态又对不上.
答
B.表示我刚才不知道现在知道了 强调过去发生的动作 从句表示客观事实,可以用一般现在时