求助，prep语法笔记213（GWD-3-Q34）

StrayLx

Shoppers in sporting goods stores, unlike （in department stores, do very little impulse shopping, not buying a pair of skis and a boomerang when they come in for a basketball, but they leave with a basketball only）
A.    in department stores, do very little impulse shopping, not buying a pair of skis and a boomerang when they come in for a basketball, but they leave with a basketball only
B.    in department stores, shop impulsively very little; someone who comes in for a basketball will leave with a basketball only and not also buy a pair of skis and a boomerang as well
C.    those in department stores, do very little impulse shopping, do not buy a pair of skis and a boomerang when they come in for a basketball, but leave with only a basketball
D.    those in department stores, do very little impulse shopping; someone who comes in for a basketball will leave with a basketball only and not buy a pair of skis and a boomerang as well  
E.    department stores, shop impulsively very little; someone will not buy a pair of skis and a boomerang when they come in for a basketball but will leave with only a basketball

括号里的是划线部分。
不能理解句子的逻辑结构，只能确定unlike的对称问题。
1.为什么可以加someone，这样的表达不是一般都认为是wordy的吗？
2.do not buy a pair of skis and a boomerang when they come in for a basketball, but leave with only a basketball作为一个实例除了加入someone的还有什么办法能和原句正确连接？