The librarian promised to get the book for me she could remember who last borrowed it.A. i

问题补充：

The librarian promised to get the book for me she could remember who last borrowed it.

A. in case

B. if only

C. even if

D. ever since

答案：

A. in case

B. if only

C. even if

D. ever since

解析：if only如果….，如果她能想起来上次谁借的那本书，她答应就借给我。故选B。