Thank you!You'd better add a cover ?your book in order to keep it clean.这个句子中的介词是用on 还是to

分类: 作业答案 • 2022-08-06 15:49:12

问题描述：

Thank you!
You'd better add a cover ____?____your book in order to keep it clean.
这个句子中的介词是用on 还是to

答

add on
add on意为另外加上去
add to意为增加

Thank you!You'd better add a cover ____?____your book in order to keep it clean.这个句子中的介词是用on 还是to