his parents strongly advised him nothis parents strongly advised him not to get mixed with such people,______didn't help at all,though.Tank you!
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his parents strongly advised him nothis parents strongly advised him not to get mixed with such people,______didn't help at all,though.Tank you!
his parents strongly advised him not
his parents strongly advised him not to get mixed with such people,______didn't help at all,though.
Tank you!
his parents strongly advised him nothis parents strongly advised him not to get mixed with such people,______didn't help at all,though.Tank you!
which,which引导非限定性定语从句时可以代替主句,即以整个主句作为先行项.
他的父母强烈告诫他不要和这样的人混在一起,但这并没有起到任何作用.
楼上（在我添加此修改前本来应该是楼下）的回答有些问题.貌似不懂as的用法呀.as可以引导非限定性定语从句不假,但一般都是对主句的一种强调或确定,常可翻译成：正如…….
例如：
He knows nothig about English grammar,as can be seen from his answer to this question.
The earth goes around the sun,as is known to all.
在这里肯定是不能用as的,这么用别人听不懂的.因为这里的后半句是和前半句形成转折关系的,而不是确定或强调.
as as在句子中代替前面整个句子的意思 并在从句中充当主语，as也可以引导非限制性定语从句，而且代替前面整句话的意思 用as的比较多 所以我建议你选择as，当然这道题的情况下用which也不是不行，只是我不喜欢
http://www.examda.com/zhongkao/wyfd/yufa/20060929/161003341-2.html关于非限制性定语从句的详...
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as as在句子中代替前面整个句子的意思 并在从句中充当主语，as也可以引导非限制性定语从句，而且代替前面整句话的意思 用as的比较多 所以我建议你选择as，当然这道题的情况下用which也不是不行，只是我不喜欢
http://www.examda.com/zhongkao/wyfd/yufa/20060929/161003341-2.html关于非限制性定语从句的详细资料 你看一下 对你会有帮助
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which
因为前面有"," 非限制性定语从句,不能用that.