问题
单项选择题
All vessels at mooring（）move to the sheltered anchorage.
A.must
B.have to
C.must be
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
All vessels at mooring（）move to the sheltered anchorage.
A.must
B.have to
C.must be
参考答案：A