题目内容

Actions ______ be taken to stop H7N9 from spreading again.
A．mustB．mayC．can’tD．needn’t
A

试题分析：句意:必须马上采取行动来阻止Ｈ７Ｎ9 再次蔓延。take actions to do sth. 意为：采取行动做某事，这里用了这个句型的被动形式。根据句意可知，H7N9这个病毒传播的很快，故我们必须马上采取行动，这里的语气是非常强硬的，故用must,必须。may 可以；can’t 不能，不会；needn’t 不必要。
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