标题: 求助！！这题E明显很对 为什么不选？ [打印本页] 作者: lllmmm 时间: 2010-12-20 10:50 标题: 求助！！这题E明显很对 为什么不选？ According to entomologists, single locusts are quiet creatures, but ***************they become excited, change color, vibrate, and even hum.
A. when locusts are placed with others of their species, B. when placing them with others of their species, then C. locusts, when placed with others of their species, D. placing them with others of their species, E. placed with others of their species, then E明明很正确 怎么不选E！！作者: sdcar2010 时间: 2010-12-20 11:37
"then" is wrong.作者: lllmmm 时间: 2010-12-20 11:45
跟我的想法一样 谢谢大牛