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

A. do B. done

C. be done D. be doing

【答案】C

【解析】

句意为了保护鲨鱼一些事情必须被做了因为鲨鱼中的许多现在遭受危险。动词do意为“做”,A是其原形,B是其过去分词,C是其被动语态原形,D是其现在进行时,事情只能是“被做”,因此需要使用被动语态be done,must是情态动词“必须”,其后加动词原形,所以是must be done,意为“必须被做”,故选C。

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