7. It was Shanghai        the Communist Party of China was founded .

     A. where         B. that            C. at which            D. that where

〖答案与简析〗选A。测试强调句与定语从句不能混淆，这里是定语从句。若把Shanghai 的前面加上介词 in 时，就是强调 地点，这时就可以选 B。