By using previous communication system, rescue is often a matter of chance. What does “a matter of chance” mean?（）<br>A:occasionally<br>B:accidentally<br>C:often<br>D:usually

By using previous communication system, rescue is often a matter of chance. What does “a matter of chance” mean?（）
A:occasionally
B:accidentally
C:often
D:usually

出自：海船船员证

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