---What are you busy with ?--- We are carrying out a research ____ the causes of cancer.
#27580
A
into
B
onto
C
to
D
in
推荐题目
----What made Professor Zhang so angry this morning? ---- Paul and Bill told lies,but neither of them apologized______it.
#26937
A
to
B
for
C
with
D
on
The tiger, once a ____ animal to humans, is now ____of disappearing on the earth.
#25826
A
dangerous, danger
B
in danger, in danger
C
dangerous, in danger
D
danger, in danger
Frank was offered a job in a bank, but________our surprise, he didn't take it. ( )
#25451
A
to
B
at
C
for
D
in
In order to be _______ for Christmas, all these gifts must be mailed immediately.
#25874
A
in time
B
at one time
C
at a time
D
in no time