China has thousands of islands,the largest of_____is Taiwan.

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China has thousands of islands,the largest of_____is Taiwan.
为什么填which

这是一个典型的定语从句,定语从句是由关系代词或关系副词引导的从句,其作用是作定语修饰主句的某个名词性成分,相当于形容词,所以又称为形容词性从句,一般紧跟在它所修饰的先行词后面.
引导定语从句的关联词称为关系词,关系词有关系代词和关系副词.关系代词有that,which,who,whom,whose,as等；关系副词有where,when,why等.关系词常有3个作用：1,引导定语从句.2,代替先行词.3,在定语从句中担当一个成分.
1.that既可代表事物也可代表人,which代表事物；它们在从句中作主语或宾语,that在从句中作宾语时常可省略关系词,which在从句中作宾语也可以省略.[eg：this is your book （which）you want.]而且,如果which在从句中作“不及物动词＋介词”的介词的宾语,注意介词不要丢掉,而且介词总是放在关系代词which的前边,但有的则放在它原来的位置
2.which作宾语时,根据先行词与定语从句之间的语义关系,先行词与which之间的介词不能丢
3.代表物时多用which,但在带有下列词的句子中用that而不用which,这些词包括当先行词是anything,everything,nothing ,few,all,none,little,some等不定代词时,或者是由every,any,all,some,no,little,few,much等修饰时等,这时的that常被省略还有先行词前有序数词或形容词最高级修饰时,或先行词就是序数词或最高级时.以及先行词中既有人又有物时.还有句中前面有which时,都只能用that
4.who和whom引导的从句用来修饰人,分别作从句中的主语和宾语,whom作宾语时,要注意它可以作动词的宾语也可以作介词的宾语.

China has thousands of islands,the largest of_____is Taiwan. China has thousands of islands,the largest _____ is Taiwan. China has hundreds of islands,________ the largest is Taiwan China has hundreds of islands,____ the largest is Taiwan. China has thousands of islands,the largest of which （is） Tai China has many islands,____the largest is Taiwan China has hundreds of islands,___Taiwan is the largest China has hundreds of islands,__is Taiwan. China has thousands of islands,___Hainan Island is the large . China has hundreds of islands, _____ is Taiwan. A．the larg China has a lot of islands,one of____is TaiWan China has hundreds of islands,_____ is Taiwan Is