How long _____you _____the library book?-For three days.
A.A.have; borrowed
B.B.have; kept
C.C.did; borrow
D.D.were; kept
答案:B
分析：首先根据整个句子,我们可以得出应该使用现在完成时态,但是borrow为点动词,不是持续动词.故选择B.