How long can I your book?A. lend B. borrowC. returnD. keep

问题补充：

How long can I your book?

A. lend

B. borrow

C. return

D. keep

答案：

A. lend

B. borrow

C. return

D. keep

解析：句意：我能保存这本书多长时间？A. lend借出，瞬间性动词；B. borrow借入，瞬间性动词；C. return回来，瞬间性动词；D. keep保存，延续性动词。此处与how long时间段连用，故用延续性动词。故选D。