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 fallenC．to fa-高中英语-n多题

◎ 题干

More bison were killed．The bison population is thought ______ from 60 million to just a few hundred between 1850 and 1910.

A．to have fallen	B．having fallen
C．to fall	D．falling

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