请教：prep2-60一题

juan_fly

60.   (27602-!-item-!-188;#058&003606)

Pioneered by scientists at Los Alamos National Laboratory, BEAM robots are not programmed to walk; instead they use brainlike circuits called neural networks to learn to walk through trial and error.

 

(A) BEAM robots are not programmed to walk; instead they use brainlike circuits called neural networks to learn to walk through trial and error

(B) BEAM robots learn to walk through trial and error by using brainlike circuits called neural networks instead of by programming them

(C) BEAM robots are not being programmed to walk but instead using brainlike circuits called neural networks and learning to walk through trial and error

(D) brainlike circuits called neural networks are used instead of programming for BEAM robots learning to walk through trial and error

(E) brainlike circuits called neural networks are being used for BEAM robots that learn to walk through trial and error instead of being programmed

请问B答案为什么错了？看了半天没看出来，是instead of 吗？可是正确答案A也用了instead 啊

求解于大家！

overthere33

instead of作为介词短语 前后比较要一致 B里面就成了 using 和 programming的比较 但programming是个主动的形式 机器人是不会自己编程的

instead本身作为副词 是相反 然而的意思 A选项里面使用正确

忠告 不要背XDF的教条

alibaba_2009

"instead of" generally introduces noun phrase.In choice b, the words phrasing "by programming them" after "instead of" is a form of preposition +v-ing,so you can pick this choice out as a wrong one.