问题补充：
.— John this week?
—Yes.
—Where him?
—In the library.
A. Did you see; did you see
B. Have you seen; did you see
C. Do you see; have you seen
D. Have you seen; have you seen
答案：
A. Did you see; did you see
(答案→)B. Have you seen; did you see
C. Do you see; have you seen
D. Have you seen; have you seen
解析：“你本周见John了吗”？强调对现在造成的影响，用现在完成时；“在哪儿见的”强调的为过去的事实，用一般过去时。故选B。
