--- May I smoke here? --- If you       , choose a seat in the smoking section.
#63523
A
should
B
could
C
must
D
may
推荐题目
Jim______   sing Chinese songs very well now, but he______do it last year.
#75382
A
can; can’t
B
could; can’t
C
can; couldn’t
D
could; couldn’t
 It was very kind of you to do the washing-up but you _____ it
#62541
A
needn’t do
B
shouldn’t do
C
mustn’t have done
D
needn’t have done