题目内容
Now naturalists have been making great efforts to save the living creatures which are ________.
- A.dying out
- B.died out
- C.dead out
- D.dying off
A
be dying out意为“正在灭绝”即“快要灭绝”。
be dying out意为“正在灭绝”即“快要灭绝”。
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