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

試題分析:句意:必須馬上采取行動來阻止H7N9 再次蔓延。take actions to do sth. 意為:采取行動做某事,這里用了這個句型的被動形式。根據(jù)句意可知,H7N9這個病毒傳播的很快,故我們必須馬上采取行動,這里的語氣是非常強硬的,故用must,必須。may 可以;can’t 不能,不會;needn’t 不必要。
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