I must return the book to the library. I it for one week.A. keepB. borrowedC. have keptD.

问题补充：

I must return the book to the library. I it for one week.

A. keep

B. borrowed

C. have kept

D. have lent

答案：

A. keep

B. borrowed

(答案→)C. have kept

D. have lent

解析：考查现在完成时。过去发生的动作一直持续到现在是现在完成时表示的内容。因为一星期是一段时间，所以必须用延续性动词。