Hi,Mike!Nice to meet you here.I _____ you joined the club.A.didn't know.B.haven't known.为什么

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Hi,Mike!Nice to meet you here.I _____ you joined the club.A.didn't know.B.haven't known.
为什么

选择A.didn't know.,因为你现在已经知道了,所以不能用完成时

A

百度嫌我字数不够