问题
单项选择题
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
答案
参考答案：A
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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
参考答案：A