Meeting my uncle after all these years was an unforgetable moment,_________I will always treasure。 A。one B。what 为何不用Ｂ，当满足什么条件下才用Ｂ． 正选A。
one是代词，代替"Meeting my uncle after all these years" 或"an unforgettable moment"，one一般指代可数名词,句中“an unforgettable moment”一个难忘的时刻,用作可数名词。
what引导名词性从句，如果句中面没有“an unforgettable moment”就可以用what来引导。可以说成:What I always treasure is the unforgetablemoment---meeting my uncle after all these years 。
破折号改成 of 也行。 本题原选项中有it ,that。对学生有较强的干扰性。关键是treasure一词用做动词以及其词义学生难以 识别。
