Tom was thrilled           captain of our school football team.    [ ]

A. to choose            

B. having been chosen    

C. to have been chosen    

D. to be chosen

一空瓶质量为50g，装满水后的总质量为250g，则水的体积是______cm³，装满油后的总质量是210g，则油的密度为______g/cm³．