单选题This Sunday I'll go 

问题补充：

单选题ThisSundayIllgoswimmingwith___.A.the Smith brothersB.the Smith’s brothersC.the Smiths brothersD.the brothers of Smith

答案：

A解析the Smith brother已经接近合成名词的用法. Smith是名词brothers的定语,又如: the Ford family, the Greens