Scientists _______ a lot of experiments on animals, hoping to find and effective way to cure the patients who had AIDS.
#70454
A
carried on
B
carried out
C
carried away
D
carried off
推荐题目
To understand the grammar of the sentence you must break it___ into parts.
#71780
A
down
B
up
C
off
D
out
Many people ________ the accident, so it was not difficult to investigate（调查）.
#70657
A
witnessed
B
yelled
C
annoyed
D
envied
As the clock struck nine, players __________ their positions and the match began.
#68236
A
stood up
B
took up
C
made up
D
set up