这个英语单选怎么回事4.The police arrived,after _____ the situation became more peaceful.a.when b.that c.what d.which选d项 但为什么b项不对啊?涉及到什么语法知识

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这个英语单选怎么回事4.The police arrived,after _____ the situation became more peaceful.a.when b.that c.what d.which选d项 但为什么b项不对啊?涉及到什么语法知识
这个英语单选怎么回事
4.The police arrived,after _____ the situation became more peaceful.
a.when b.that c.what d.which
选d项 但为什么b项不对啊?涉及到什么语法知识

这个英语单选怎么回事4.The police arrived,after _____ the situation became more peaceful.a.when b.that c.what d.which选d项 但为什么b项不对啊?涉及到什么语法知识
which,that
它们所代替的先行词是事物的名词或代词,在从句中可作主语、宾语等,例
关系代词that和which 都可以指物,that 和Who 都可以指人,
1)不用that的情况
a) 在引导非限定性定语从句时
(错) The tree,that is four hundred years old,is very famous here.
b) 介词后不能用
We depend on the land from which we get our food.

which 引导非限制性定于从句

这是个非限制定语丛句.which指代前文the police arrived

一题一分。

要是用that after that后必须有“,”才行