More bison were killed.The bison population is thought ______ from 60 million to just a few hundred between 1850 and 1910.
#96722
A
to have fallen
B
having fallen
C
to fall
D
falling
推荐题目
How about the rest of us _____ a meeting after dinner?
#98014
A
will have
B
have
C
to have
D
having
Early peoples moved around, ______ the herds of animals.
#88577
A
having followed
B
followed
C
following
D
to follow
You'd better not have the lights _____ all day long.
#98324
A
burning
B
burned
C
to burn
D
being burnt