核心问题
请解释 in a matter of 与 on the matter of 在意义和用法上的区别。
词典解答
（in）a matter of 常常放在时间词 minutes, hours, days, weeks, years 或其他度量词(如 pounds)之前,用于表达“言其少”的口气:
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Don't worry, it's only a matter of hours till the doctor arrives. (LDCE) 别着急，医生在几小时后就会赶到。
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The police arrived in a matter of minutes. (MD) 警察仅仅几分钟就到达了。
而 on the matter of 则是表示“在……方面”“关于”。试比较: with reference to, with regard to, as for:
请做下面的试题：
Some insects pass through their entire life cycles, from egg to adult ____ days or weeks.
A. based on B. in case of C. in a matter of D. in time for