提高对腰椎间盘突出症诊断的精确性，确定手术部位的特殊检查是()

A．椎管造影

B．B超检查

C．MRI检查或CT检查

D．腰椎正侧位片

E．可视性椎间盘造影

— Did you go to the open-air concert?

— No. We ____. but we spent too much time shopping. [ ]

A. could have gone

B. must have gone

C. can't have gone

D. shouldn't have gone