— It remains ______ whether Dave will be fit enough to play in the finals.    

— Oh, no! Without him, we will lose the game. [ ]

A. seen       

B. to be seen     

C. seeing          

D. to see

水压试验时，主压头上的主液压缸的前进和后退主要由（）带动。

A、托辊

B、后压头

C、钢管

D、侧面油缸