If you           spit at all, please spit in the bucket(痰孟里)provided
#63179
A
must
B
shall
C
should
D
may
推荐题目
 My sister met him at the street yesterday afternoon, so he __________ your lecture.
#63076
A
shouldn’t have attended
B
needn’t have attended
C
mustn’t have attended
D
couldn’t have attended
People who drink wine ______ to drive after May Day. 
#77648
A
don’t allow
B
isn’t allowed
C
mustn’t allow
D
mustn’t be allowed