Her son went abroad several years ago, since when she hasn't heard
from him.请问这句话since前面的逗号可以省略吗？
网校学员Lin**在学习新托福中级语法【随到随学班】时提出了此问题，已有1人帮助了TA。
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同学你好，该知识点来自沪江网校《新托福中级语法【随到随学班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。
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新托福中级语法【随到随学班】
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Her son went abroad several years ago, since when she hasn't heard
from him.请问这句话since前面的逗号可以省略吗？ -
Her son went abroad several years ago, since when she hasn't heard
from him.为什么这里要用逗号隔开呢？是非限制性定语从句吗？ - Whosoever
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Her son went abroad several years ago, since when she hasn't heard
from him.请问这句话since前面的逗号可以省略吗？