【单选题】
The monument(里程碑) was built in honor of the explorer who was believed________the river.
①
to have discovered
②
to have been discovered
③
to discover
④
having been discovered
【单选题】
13.The monument(里程碑) was built in honor of the explorer who was believed ____the river.
①
to have discovered
②
to have been discovered
③
to discover
④
having been discovered
【单选题】
以下哪项不是腰椎内镜手术演进过程中的重要里程碑？
①
Kambin三角的提出
②
显微镜下椎板间手术的首次描述
③
脊柱内窥镜下的水下解剖技术
④
Hippocrates的手术治疗原则
⑤
Sebastian Rütten的椎板间内镜手术