—Must I clean the blackboard now?    —No, you _______ clean it later.
#76778
A
must
B
needn’t
C
can
D
shouldn’t
推荐题目
– I ran 10 miles last weekend. Can you believe that? – Wow, that ______ easy!
#62638
A
mustn' t be
B
mustn't have been
C
can't have been
D
couldn’t be
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
 You’d better _____ too much fried chicken. It’s not good for your health .
#76037
A
not to eat
B
don’t eat
C
not eat
D
to not eat
She ________ when she received her medical report.
#63609
A
could help but to cry
B
couldn’t help but crying
C
couldn’t help crying
D
couldn’t help to cry