2. 外语
  3. Dr. Munoz______experimental methods for obtaining energy from natural sources long before GDS Incorporated developed its own.

Dr. Munoz______experimental methods for obtaining energy from natural sources long before GDS Incorporated developed its own.

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问题 Dr. Munoz______experimental methods for obtaining energy from natural sources long before GDS Incorporated developed its own.
选项 A、is devising
B、had devised
C、was devised
D、has devised
答案B
解析 从句“long before…own”中使用了状语从句引导词before(在……前)，可知主句中提及的事情发生在从句的动作之前。为表达在过去特定的时间点(GDS公司发展自己的方式)之前发生的事(穆诺茨博士研究获得能源的方法)，应用过去完成时。因此过去完成时(B)had devised为正确答案。空格后有动词宾语experimental methods，故被动语态(C)不正确。
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