求助！！这题E明显很对为什么不选？

lllmmm · 发表于 2010-12-20 10:50:21

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！！

lllmmm · 发表于 2010-12-20 11:45:10

跟我的想法一样谢谢大牛

sdcar2010 · 发表于 2010-12-20 11:37:39

"then" is wrong.

本贴相关题目 TN-19-SC-21 (ENGR)

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求助！！这题E明显很对 为什么不选？

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求助！！这题E明显很对为什么不选？