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，某人據(jù)認(rèn)為已經(jīng)做了什么，句意是;更多的野牛被殺死，野牛數(shù)量被認(rèn)為在1850到1910之間已經(jīng)從6千萬下降到幾百頭了。選A。
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