这句话题干就是错的.they haven't 如果是完成时的话缺少动词 需要添加实义动词haven't have/get才是完整局.或者就是they don't have.在正确题干情况下选c,句意：越来越多的鸟类处在危险状态下,因为他们没有足够多的空间生存.你想选什么啊,这个很明显这能选c.
More and more birds are in danger because they haven't ____t
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