I still remember the park____we first met.
A that B which C where D when
选c
楼主应该知道这句是个定语从句.那么就是选关系代词和关系副词的区别了.关系代词和关系副词最大的区别就是它们在相应的定语从句中所作的句子成分是不一样的.关系代词（that,which,who）在定语从句中作的句子成分是主语,宾语,表语（不常见）.
关系副词（只有三个where,why,when）分别作地点状语、原因状语和时间状语.
那么我们也看所给的定语从句
（）we first met.应该是we first met in the park.显然in the park是地点状语,所以要选关系副词where作地点状语.
I won't go to Shanghai again because I ____there before
A have been to B has been C have been D had been
这个题目考点就是before 与完成时态的用法,通过I won't go to Shanghai again 这句话可判断before与现在完成时态连用.那么排除d
c肯定错,至少应该是i have
那么就剩下a 和c 了
这个语法至少就是方位副词（there,here,home,outside）前不加介词to
所以选c