问题
单项选择题
All NAVTEX messages（）owing to their nature of importance.
A.can suppress
B.can be suppressed
C.can not be suppressed
D.are to be suppressed
答案
参考答案：C
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All NAVTEX messages（）owing to their nature of importance.
A.can suppress
B.can be suppressed
C.can not be suppressed
D.are to be suppressed
参考答案：C