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

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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
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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
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

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
add on
add on意为另外加上去
add to意为增加

You need to buy some books.You'd bett find a__________.意思是什么?横线上的怎么填? thank you thank you thank you thank you~ thank you Thank you Thank you Thank you, Thank you Thank You Thank you! THANK YOU Thank you Thank.You thank you thank you~ Thank you.