prep08-Q213 and和as well为何不重复 求大牛解答~

Odreamer

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
能选出D没问题，但不明白语法笔记里对D项的说明：说“这里and和as well不重复，as well修饰的是and后面的谓语动词buy”，为什么呀？
还说“类似见prep2-166补充说明中对but instead的说明”，看了，可还是不太懂。。。说but接动词时做连词，可以接instead，but接名词时做介词，不可接instead。。。首先，but接名词为什么做介词我就不懂，为什么不是做并列连词呢，然后，我查了，and的词性只有连词啊。。。。
求大牛现身~~~~~

DUKB24

http://www.manhattangmat.com/forums/boomerang-impulse-shopping-t13477.html



最后一个instructor的解释

Odreamer

http://www.manhattangmat.com/forums/boomerang-impulse-shopping-t13477.html



最后一个instructor的解释

-- by 会员 DUKB24 (2012/10/10 23:28:56)

有点懂了，是不是说 and连接两个动作，造成了语意的平行，而后一个动作再用as well修饰可以起到弱化语意的作用，而此题刚好是强调前一个动作的，所以and可以再接as well修饰。。。语意层次的解释比语法死抠高级也有效多了，多谢~

DUKB24

嗯

meaning is conveyed by structure（both are interdependent）