prep 老 1--23 高人请指教啊！

cynthia627

23.   (25612-!-item-!-188;#058&002525)


Scientists believe that unlike the males of most species of moth, the male whistling moths of Nambung, Australia, call female moths to them by the use of acoustical signals, but not olfactory ones, and they attract their mates during the day, rather than at night.



(A) by the use of acoustical signals, but not olfactory ones, and they attract


(B) by the use of acoustical signals instead of using olfactory ones, and attracting

(C) by using acoustical signals, not using olfactory ones, and by attracting

(D) using acoustical signals, rather than olfactory ones, and attract

(E) using acoustical signals, but not olfactory ones, and attracting

OMA：D

这道题我的疑惑在于，这里的using结构是怎么回事？在句子里面做什么成分呢？我老是觉得应该加个by……高人请指点！谢谢！！！

cynthia627

没办法，我自己顶！高人们，帮忙啊~~~

sayysong

by + v.ing 或者 by + n. 是介词短语做方式状语
仅仅用using的话，是分词做方式状语，都可以的。