gwd28-21

gonghao

only A is correct

Eliott

up

dayfeeling

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！！

yzhao26

up

jean1280

up

Liu_leaf

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.

 

1. when locusts are placed with others of their species,
2. when placing them with others of their species, then-placing的逻辑主语错误；
3. locusts, when placed with others of their species,－locusts和they重复；
4. placing them with others of their species,－逻辑主语问题
5. placed with others of their species, then－过去分词做时间状语，it is OK，但是这里的then是多余，过去分词已经表示了when引导状语从句一样的时间概念，再使用then没有道理；2，后面的they最好改为locusts，虽然这里的they应该优先指代前句主语，既locusts，但是由于要采用过去分词来充当时间状语，既过去分词的主语也是代词，容易造成读者在连续两次指代之后分不清they的具体指代，拿数学的一个概念来形容就是有点象“等价替换”的概念，使阅读起来不直观；

Liu_leaf

补充一个过去分词做时间状语的例子：seen from top of mountain, the city is very beautiful.

VeniceBingo

感谢LS,好清晰