According toentomologists, single locusts are quiet creatures, but when locusts areplaced with others of their species, they become excited, change color,vibrate, and even hum. A. whenlocusts are placed with others of their species, B. whenplacing them with others of their species, then C. locusts,when placed with others of their species, D. placingthem with others of their species, E. placedwith others of their species, then
答案是a,我选的d,when很重要吗?
|