1.The police arrived,after ______the situation became more peaceful.A.when B.that C.which D.what解析：which引导非限制性定语从句,指代主句“The police arrived”.从句指“在警察到达之后,形势变得更加稳定了”.【解

1.The police arrived,after ______the situation became more peaceful.A.when B.that C.which D.what解析：which引导非限制性定语从句,指代主句“The police arrived”.从句指“在警察到达之后,形势变得更加稳定了”.【解
1.The police arrived,after ______the situation became more peaceful.
A.when B.that C.which D.what
解析：which引导非限制性定语从句,指代主句“The police arrived”.从句指“在警察到达之后,形势变得更加稳定了”.
【解析有点看不懂,求更易懂的解释.】
.
2.–The public store is to close at 9:00 p.m.
--_______________ no need to worry.It is just 7:30 p.m.
A.You have B.They have C.It is D.There is
【完全不懂】

1.The police arrived,after ______the situation became more peaceful.A.when B.that C.which D.what解析：which引导非限制性定语从句,指代主句“The police arrived”.从句指“在警察到达之后,形势变得更加稳定了”.【解
.The police arrived,after ____C__the situation became more peaceful.
A.when B.that C.which D.what
答案解析：以上是非限制性定语从句用法,非限制性定语从句只对前面的名词或者整句话内容起一个补充和解释说明,介词+关系代词/whom / which； 只人用whom,指事物或者事件,用which,这里的which 指代前面整句话的内容,就是在警方到达之后
可以改成一个时间状语从句
【After the whole arrived,the situation became more peaceful】
【The situation became more peaceful after the whole arrived】
备注:从句在前面,需要用逗号把从句和主句分开,如果从句放在后面,则不需要逗号分开
句子意思：在警方达到之后,情况变得更加平静一点了
.
2.–The public store is to close at 9:00 p.m.
--_________D______ no need to worry.It is just 7:30 p.m.
A.You have B.They have C.It is D.There is
答案解析：主要是一个存在有There be 的用法
根据句子意思,哪个公共仓库要下午9点关门,现在才下午7:30 因此没有担心的需要
There is no need to do sth 动词不定式做 后置定语

1. C。考查which引导的定语从句的用法。which引导定语从句，指代前面的整件事情。

   The police arrived（警察到达）是主句。after ______the situation became more peaceful.是从句。因为句子要表达“在（警察到达）之后，形势变得更加稳定了。”定语从句中需要一个引导词来引导整个从句，这个引导词要指代前面的整...

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   1. C。考查which引导的定语从句的用法。which引导定语从句，指代前面的整件事情。

      The police arrived（警察到达）是主句。after ______the situation became more peaceful.是从句。因为句子要表达“在（警察到达）之后，形势变得更加稳定了。”定语从句中需要一个引导词来引导整个从句，这个引导词要指代前面的整件事，所以用了which。
      

   2. D。 这是固定句型：“There is no need to do sth”表示“做某事是没有必要的。” 该句意思是：你没必要担心。现在只是七点半。

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   1原来的语序应该是 after the police arrived，the situation became more peaceful.首先·定语从句一般用which，that，指代主语只能用whichwhen状语从句不应该有after，what宾语从句
   2A不能用have，D固定搭配

   固定句型there is no need to do sth.表示不必要做什么事。

   1. which引导的非限制性定语从句时，去掉从句后主语意思仍然清晰，主句和从句常用逗号 隔开。试理The situation became more peaceful after the police arrived。这就是去掉which的还原句。 显然的what引导从句必须做一定成分，但原句完整所以不用what，更不能用that。用when为关系副词，不能指代从句且when=d...

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      1. which引导的非限制性定语从句时，去掉从句后主语意思仍然清晰，主句和从句常用逗号 隔开。试理The situation became more peaceful after the police arrived。这就是去掉which的还原句。 显然的what引导从句必须做一定成分，但原句完整所以不用what，更不能用that。用when为关系副词，不能指代从句且when=during which。

      2. There is no need to worry (about......)为习惯用语，可以用Don't worry代替。A为中文式英语，B不合意思，C不搭配
         

      
      

      我不是大神，四级的水平而已，不过高中语法很熟悉。

      纯手在线打字，望采纳。

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