横线处应该填什么?We should do something to save these endangered birds=We should _____ _____to save these endangered birds.

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横线处应该填什么?We should do something to save these endangered birds=We should _____ _____to save these endangered birds.
横线处应该填什么?
We should do something to save these endangered birds=We should _____ _____to save these endangered birds.

横线处应该填什么?We should do something to save these endangered birds=We should _____ _____to save these endangered birds.
be supposed