It has been announced that candidates       remain in their seats until all the papers have been collected.
#87782
A
can
B
shall
C
will
D
may
推荐题目
—The problem wasn’t difficult for him,was it?—No,it wasn’t.He      a more difficult one.
#89698
A
should have been given
B
ought to be given
C
would have been given
D
must be given
Look! Tom is too sleepy to work.He _______ up watching TV.
#87635
A
mustn’t have stayed
B
shouldn’t have stayed
C
mustn’t stay
D
ought not to say.