GWD13-2-34
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
Key：D
比较起来确实D好，但是我想请教一下someone一般怎么指代，指代什么。在我看来它只是指某一个人，即特定的群体，不能指代前面提到的人吧。

someone只是指某人, 随便某人, 后面的who是限定性. 所以这里是泛指+限定.

由于这里用了分号, 两句关系紧密, 所以可以理解someone为shoppers in the sporting goods stores中的某人.而且从句主语也可优先指代主句主语.