问题补充：
--- youthe film before?
----Yes, Iit last year.
A. Did ; see ; saw
B. Have ; saw; saw
C. Have; seen; saw
D. Have; seen; seen
答案：
A. Did ; see ; saw
B. Have ; saw; saw
(答案→)C. Have; seen; saw
D. Have; seen; seen
解析：通过时间状语before以前，last year去年，可知上句为现在完成时态，下句为过去时态。See的过去时态是saw，过去分词是seen，所以选C.
