our plane was then able to rise sharply and in a few seconds it cleared the mountains___ 400 feet
问题描述：
our plane was then able to rise sharply and in a few seconds it cleared the mountains___ 400 feet
A to B for C inD by
答
选D
翻译：我们的飞机得以在几秒钟内急速上升,以400英尺的高差跨过了山峰.
需要注意的是,这里clear作“跳过”的动词解