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

A. do B. done C. be done

【答案】C

【解析】

句意：必須采取措施保護鯊魚，因為現(xiàn)在很多鯊魚都瀕臨滅絕�？疾楸粍诱Z態(tài)。must do sth. 必須做某事；Something和do之間是動賓關(guān)系，故此處使用情態(tài)動詞的被動語態(tài)，其構(gòu)成為：情態(tài)動詞+be+done；do的過去分詞是done，結(jié)合選項可知C選項符合題意，故答案選C。

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