[求助]大全620

1.        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（D）

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

想知道这里的D，using前面要不要加by,直接用using和用by using都对吗？他们又有什么区别，谢谢！

个人感觉在主动中，by和using意思重复by应去掉，被动中当using是前面动词的逻辑主语时，using前一般加by，如using仍作伴随状语，using前不加by。

c可以吗？
by using acoustical signals, not using olfactory ones, and by attracting their mates during the day, rather than at night.并列表示call female moths 的2种手段。

逻辑上也没问题吧。
还有

从意思上看attract更可能和call平行，而不是use。吸引一般不是手段，而是个结果。

我认为在gmat中主动by肯定不加，被动看具体情况。前一种情况好像还没发现特例。

大家如看到主动中用by using的例子，请贴出，再一起总结。