Being able to swim sometimes is,

题目

Being able to swim sometimes is,
Being able to swim sometimes is————life and death
matter of解释为什么
还有一个选项是the difference

答案

a matter of 的意思是 关系到.的问题 意思是 能偶尔游泳是一个关乎生与死的问题
difference的话 应该加between 的