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    【题目】New medicines and instruments every day to extend life.

    A. develop B. are being developed

    C. are developing D. have developed

    【答案】B

    【解析】

    句意：为了延长生命，每天都在研制新的药物和仪器。考查动词语态辨析题。new medicines and instruments是动词develop的受动者，需用被动语态，ACD三项都是主动语态，可排除。根据句意结构，可知选B。

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