_____to his research work, the professor cared little about any other things.
#94003
A
Devoting
B
Devoted
C
Having devoted
D
To devote
推荐题目
__________ to sun, rain and wind for a long time, the stone split.
#94107
A
Being exposed
B
Having exposed
C
Exposed
D
To expose
 Carbon dioxide(CO2)_______ from burning fuels is the most common of the so-called greenhouse gases.
#91467
A
producing
B
having been produced
C
to be produced
D
produced