All________is a continuous supply of the basic necessities of life.用what 和that的区别,如下All________is a continuous supply of the basic necessities of life.A.what is needed B.for our needsC.the thing needed D.that is needed这个选A

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All________is a continuous supply of the basic necessities of life.用what 和that的区别,如下
All________is a continuous supply of the basic necessities of life.
A.what is needed B.for our needs
C.the thing needed D.that is needed
这个选A还是 D呢 ,what 和 that 在这里有什么区别

选 D that is needed
what 引导从句时,相对于 the thing that,既有先行词,又有连接词.这里已经有先行词了,所以用 that 引导

A
同位语
定语从句

选择D。这里考查的不是what和that,而是all that=what,用A的话显得多余。

选D
在限制性定语从句中 当先行词为all /everything /nothing /anything 等不定代词 时用that 引导从句。