问题

Actions ______ be taken to stop H7N9 from spreading again.
A:must
B:may
C:can’t
D:needn’t
B:may
C:can’t
D:needn’t
正确答案是:
同类题型
Where’s David?—He ______ be in the playground because he is fond of playing basketball.
The houses of the rich are generally larger than _______ of the poor.
What did your teacher say just now? —She told me Lin is _____honest boy.
Has Donnie finished reading the novel? — Not yet. There ________ still ________ of it left.