---What are you doing at the moment?-I am my turn to borrow books.A. waitingB. staying

问题补充：

---What are you doing at the moment?

---I am my turn to borrow books.

A. waiting

B. staying

C. waiting for

D. keeping

答案：

A. waiting

B. staying

(答案→)C. waiting for

D. keeping

解析：在英文中表示等待某人或某事通常用wait for，故本题选C。