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20.The government should set up some safeguards to prevent harmful vaccine accident from happening again.(改写句子,句意不变)
Some safeguards shouldbe set upto prevent harmful vaccine accident from happening again.

分析 政府应该采取一些保障措施预防有害疫苗事件再次发生.

解答 答案:be set up.
原句谓语动词用的是情态动词+动词原形,改成被动语态时,是含有情态动词的被动语态,其构成:主语+情态动词+be+动词过去分词,set的过去分词是set,故答案为  be set up.

点评 将主动语态改为被动语态时,首先观察主动语态所使用的时态,然后确定相应时态被动语态的构成,结合具体句子变可得出正确答案.

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