________ impressed the audience most was ________ the magician Liu Qian played in this year's

Spring Gala.[ ]

A. What; what        

B. What; that  

C. That; what      

D. That; that

轮对厂修、段修时，轮对内侧距离及内侧距离三处差超限，须（）。

A.退轮检查

B.更换车轴

C.更换车轮

D.加工修理