问题
单项选择题
Vessels are required（）Singapore Port Service when passing the points indicated.
A.communicating with
B.to communicate with
C.be communicated
D.will communicate
答案
参考答案：B
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Vessels are required（）Singapore Port Service when passing the points indicated.
A.communicating with
B.to communicate with
C.be communicated
D.will communicate
参考答案：B