问题描述：
A.that B.one C.it D.what
答案为B,请解释.Seeing my best friend again,after all these years was an unforgettable moment __,I will always treasure,这是完整的句子
答案为B,请解释.Seeing my best friend again,after all these years was an unforgettable moment __,I will always treasure,这是完整的句子
问题解答：
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