— I ____ to work out the maths problem in your way.  

— You can also try ____ it in your own way.     [ ]

A. managed; to do                

B. managed; doing    

C. tried; doing                    

D. tried; to do

纵隔畸胎瘤好发部位是（）。

A.前上纵隔

B.后上纵隔

C.前纵隔

D.后纵隔

E.中纵隔