疑问...GWD无重复-2-34

Q34:

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.

1. 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
2. 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
3. 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
4. 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
5. 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

答案D  

C选项里  do......,do not.....,but do....可以理解为平行对称吗?

No

it seems awkward to use "do,do not do ,but do"

"not...but" used here is not that clear to make the sentence meaning.

furthermore,"but leave with only a basketball"distorted the meaning since  "only" should be placed at the end of the phrase. 

明白了..谢谢BZ

那么but的作用可以象是and一样用来并列2个对称的结构吗..??

A,B,and C

A,B,but C

A,B,but C

I haven't seen that structure before