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？
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。
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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？