2. 外语
  3. Early in the ancient times, farmers did experiments(improve)______ the agricultural productivity.

Early in the ancient times, farmers did experiments(improve)______ the agricultural productivity.

admin2016-10-21  67
问题 Early in the ancient times, farmers did experiments(improve)______ the agricultural productivity.
选项
答案to improve。
解析 根据句子结构判断，空格处应为动词不定式作目的状语，所以空格处应填入improve对应的动词不定式形式to improve。
转载请注明原文地址:https://www.kaotiyun.com/show/8v0K777K
本试题收录于： 大学英语三级B级题库大学英语三级分类
0

大学英语三级B级

大学英语三级

相关试题推荐
随机试题
最新回复(0)