28-21: According to entomologists, single locusts are quiet creatures, but when locusts are placed with others of their species, 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
我想问一下,E选项的问题到底是什么:then只能连接两个并列结构吗?是否把then去掉就可以了?就变成:
...,but placed with others..., they become...
placed在这里做状语。
多谢!!
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