i'm glad that Peter decided to come to the party because we___him for several years.A.haven't seen B.don't see C.didn't see D.hadn't seen 问:选什么,为什么?

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i'm glad that Peter decided to come to the party because we___him for several years.A.haven't seen B.don't see C.didn't see D.hadn't seen 问:选什么,为什么?

选A
选现在完成时的标志性短语是for serval years 已经多年未见

A haven't seen
前面是 I am glad, 现在式. 所以haven't seen 已经没有看见