After ________in the research for so many years，the scientist succeeded in finding the result at last.
#93113
A
buried
B
being buried
C
having buried
D
having been buried
推荐题目
The supermarket next month will be the biggest one in the city.
#91582
A
completed
B
being completed
C
to be completed
D
having been completed
The English in this story has been simplified to make it easier _______.
#96054
A
to be understood
B
understood
C
understanding
D
to understand
_______ to sunlight for too much time will do harm to one’s skin, so you should make it a rule to get your skin creamed before going out in summer.
#90974
A
Exposed
B
Having exposed
C
Being exposed
D
To expose