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All ________ is a continuous supply of the basic necessities of life.
A、the thing needed
B、for our needs
C、what is needed
D、that is needed
【正确答案】：D
【题目解析】：根据句子结构，我们可以看出，题目中句子结构完整，可以填入的只能是起修饰或辅助作用的成份，如定语或状语，D为正确答案，that is needed 在这里作定语，修饰先行词all