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  68
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。
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