You couldn't have seen such an animal, for they have already ___ in the world.A died awayB died down C died offD died out

问题描述:

You couldn't have seen such an animal, for they have already ___ in the world.
A died away
B died down
C died off
D died out

选 D
这边是考察这几个短语的意思
die away ,消失
Died down:偃旗息鼓
died off:一个一个地死去
died out灭绝