单选题
All ______ is a continous supply of the basic necessities of life.
A、
what is needed
B、
for our needs
C、
the thing needed
D、
that is needed
【正确答案】
D
【答案解析】
[分析] 测试定语从句。句中all既是主语又是定语从句先行词。当先行词是不定代词all，everything， something，nothing等时，必须由关系代词that引导定语从句。
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