2. 外语
  3. A theory often involves an imaginary model that helps scientists picture the way an observed event could (produce) ______.

A theory often involves an imaginary model that helps scientists picture the way an observed event could (produce) ______.

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问题 A theory often involves an imaginary model that helps scientists picture the way an observed event could (produce) ______.
选项
答案be produced
解析 本题考查动词的语态变化。在修饰the way的定语从句中，主语an observed event与谓语produce之间存在逻辑上的被动关系，需要使用produce的被动式：况且跟在情态动词could的后面，所以用be produced。
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