The trees produce a chemical to protect themselves from insects.(保持句意不变）The trees produce themselves from insects _ _ a chemical.

分类: 作业答案 • 2022-02-15 12:41:42

问题描述：

The trees produce a chemical to protect themselves from insects.(保持句意不变）
The trees produce themselves from insects _____ _____ a chemical.

答

by producing

The trees produce a chemical to protect themselves from insects.(保持句意不变 ）The trees produce themselves from insects _____ _____ a chemical.