All________is a continuous supply o

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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

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  • 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