----Would you like to watch the three-D film Titanic with me ?----Certainly. I don’t mind

问题补充：

----Would you like to watch the three-D film Titanic with me ?

----Certainly. I don’t mind seeing it again although I it twice.

A. saw

B. was seen

C. have seen

D. had seen

答案：

A. saw

B. was seen

(答案→)C. have seen

D. had seen

解析：考查动词的时态用法。根据句意及句末的twice，可知这个片子我已经看过两次，不涉及过去时间，因此用现在完成时。