I think Quanzhou City and Xiamen City are similar in both 0f the two cities are located on the seaside.
A. what
B. that
C. which
D. where
网友回答
A. what
(答案→)B. that
C. which
D. where
解析：固定搭配in that因为；句意：我认为泉州和厦门很相似，是因为这两个城市都位于海边。根据句意说明B正确。ACD三项都不能和in 连用形成固定的连词搭配。