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

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

admin2009-05-28  72
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。
转载请注明原文地址:https://www.kaotiyun.com/show/jSvK777K
本试题收录于： 大学英语三级A级题库大学英语三级分类
0

大学英语三级A级

大学英语三级

相关试题推荐
随机试题
最新回复(0)