定从中as不能作为关联词
she had a visit in Paris是从句 修饰a wonderful time
Mrs Black had such a wonderful time last year.是主句先行词要怎么还原回去 位置放在那里？a wonderful time就是先行词恩 但是 a wonderful time 还原到从句中在什么位置哪？这边从句完整，关系副词when在定语从句中用作时间状语改成这样就行了she had a visit in Paris at such a wonderful time.