—Jack, _____ you behave yourself? You're no longer a kid．—Sorry, Daddy．It won't happen again．
#63299
A
mustn't
B
can't
C
should
D
would
推荐题目
It is usually warm in my hometown in March, but it _____ be rather cold sometimes.
#63464
A
would
B
can
C
should
D
must
Students ___________ remain in their seats until all the papers have been collected.
#63046
A
may
B
shall
C
need
D
can
—Must I clean my room now, Mum?—_______. You can do it tomorrow.
#75944
A
No, you needn’t
B
No, you mustn’t
C
Yes, you need
D
Yes, you must
This book _______ Lucy’s . Look! Her name is on the book cover（封面）.
#77222
A
must be
B
may be
C
can’t be
D
mustn’t be