Avatar is an interesting film. I it twice already.A. seeB. sawC. have seenD. will see

问题补充：

Avatar is an interesting film. I it twice already.

A. see

B. saw

C. have seen

D. will see

答案：

A. see

B. saw

(答案→)C. have seen

D. will see

解析：考查现在完成时。twice“两次”，常与完成时连用。already“已经”，常与现在完成时连用。句意“《阿凡达》是一部很有趣的电影，我已经看了两次了。”现在完成时的构成是have/has done sth.。故选C。