We _____ last night, but we went to the concert instead. [ ]

A. must have studied

B. might study

C. should have studied

D. would study

技能培训的特点是通过培训者的操作示范和传授技艺，要让受训者（）熟练地掌握。

A.模拟操作

B.亲自动手

C.观看操作

D.观看录像