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
When somewhat better ________ academically, he returned home to continue his research.
#95711
A
equipped
B
had equipped
C
provided
D
providing
The General Manager suggests those found ______ in the office would be fired immediately.
#96229
A
smoke
B
to smoke
C
smoking
D
smoked
—Have you been to the painting show?—Yes,the art works by some country children attracted visitors’ attention.
#98094
A
to be sent
B
having been sent
C
sent
D
being sent