23. October 1, 1949 was the day _____ the People’s Republic of China was founded. A. which B. when C. where D. in which

　　24. Is this the shop _____ sells children’s clothing?

　　A. which B. where C. in which D. what

　　25. Is this museum _____ they visited last month?

　　A. that B. which C. where D. the one