---Have you brought the book I lent to you yesterday?-Sorry I put it on my bookshelf a

问题补充：

---Have you brought the book I lent to you yesterday?

---Sorry, I put it on my bookshelf and all about it

A. had forgotten

B. forget

C. forgot

D. will forget

答案：

A. had forgotten

B. forget

(答案→)C. forgot

D. will forget

解析：考查时态。句意：昨天你带来了我借给你的那本书吗？——抱歉，我把它放在书架上，完全忘了这回事。可知下文描述的过去发生的动作，故用过去时态，选C。