2. 外语
  3. In recent years, oil______ (substitute) for certain natural materials.

In recent years, oil______ (substitute) for certain natural materials.

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问题 In recent years, oil______ (substitute) for certain natural materials.
选项
答案has substituted
解析 动词时态。根据时间状语in recent years(通常用于完成时态)，此处需用现在完成时。
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