Don’t forget the book to the library when you finish it.A. to give back ; to readB. to r

问题补充：

Don’t forget the book to the library when you finish it.

A. to give back ; to read

B. to return ; reading

C. returning ; reading

D. returning ; to read

答案：

A. to give back ; to read

(答案→)B. to return ; reading

C. returning ; reading

D. returning ; to read

解析：考查动词固定搭配。Forget to do sth忘记要做某事；forget doing sth忘记做了某事；finish doing sth做完某事；句意：当你读完这本书的时候，不要忘记把这本书还给图书馆。根据句意是指“忘记要做某事”“forget to do sth”；故B正确。