When it ______ research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
#71865
A
refers to
B
related to
C
comes to
D
talks to
推荐题目
She has a gift for communication and should be as a tour guide.
#72167
A
suggested
B
recommended
C
demanded
D
provided
He is used to ___________ to his office in spite of bad weather.
#68448
A
to walk
B
walking
C
walked
D
has walked
--- What are the workers talking about ?--- They are discussing the idea the old worker ______ at the meeting yesterday.
#65850
A
put forward
B
came up
C
set off
D
brought out
Many people ________ the accident, so it was not difficult to investigate（调查）.
#70657
A
witnessed
B
yelled
C
annoyed
D
envied