题目信息
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
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正确答案：
A:when locusts are placed with others of their species,
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