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    精英家教网 > 高中英语 > 题目详情
    More bison were killed．The bison population is thought ______ from 60 million to just a few hundred between 1850 and 1910.
    A．to have fallenB．having fallen
    C．to fallD．falling
    A
    考查句型;Sb /sth is thought to have done，某人据认为已经做了什么，句意是;更多的野牛被杀死，野牛数量被认为在1850到1910之间已经从6千万下降到几百头了。选A。
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