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It remains________whether herd immunity ...

It remains________whether herd immunity that most of the Europeans countries have taken in response to the epidemic works.

A.to see B.to be seen C.seeing D.being seen

 

B 【解析】 考查非谓语动词的被动形式。句意:大多数欧洲国家对流行病已经采取的的群体免疫是否起作用尚待观察。分析句子,并结合句意可知,此处使用remain to do结构,表示有待做的事情,表动作尚未发生,且动词see和主语It之间是被动关系,所以使用动词不定式的被动形式,故选B项。  
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