问题
单项选择题
It is dangerous for vessels without the operational radar（）the estuary.
A.to get
B.to approach
C.to proceed
D.to close
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
It is dangerous for vessels without the operational radar（）the estuary.
A.to get
B.to approach
C.to proceed
D.to close
参考答案：B