问题
选择题
The Great Wall was built to keep ______ the invaders.
A．in
B．out
C．up
D．off
答案
答案：B
固定搭配keep—out意思“防御----”
搜题请搜索小程序“爱下问搜题”
The Great Wall was built to keep ______ the invaders.
A．in
B．out
C．up
D．off
答案：B
固定搭配keep—out意思“防御----”