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Something must ________to protect the sh...

Something must ________to protect the sharks because many of them are endangered now.

A. do    B. done    C. be done

 

C 【解析】 句意:必须采取措施保护鲨鱼,因为现在很多鲨鱼都濒临灭绝。考查被动语态。must do sth. 必须做某事;Something和do之间是动宾关系,故此处使用情态动词的被动语态,其构成为:情态动词+be+done;do的过去分词是done,结合选项可知C选项符合题意,故答案选C。  
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