You must（）in this area unless you have messages about the casualty.<br>A:keep radio silence<br>B:keep radio silent<br>C:keep radio be silent<br>D:keep silent the radio

You must（）in this area unless you have messages about the casualty.
A:keep radio silence
B:keep radio silent
C:keep radio be silent
D:keep silent the radio

出自：海船船员证

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