All _______ is a continuous supple of raw materials.A、what is neededB、thing nee

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问题 All _______ is a continuous supple of raw materials.

选项 A、what is needed
B、thing needed
C、that is needed
D、is needed

答案 C

解析 此题考查定语从句的用法。当all为先行词时,其定语从句常由关系代词that来引导,如that在定语从句中做宾语,常可省略。因此可以排除B项和D项,C项符合题意。A项错在先行词的重叠,因为what本身兼具先行词和关系代词的作用,如果去掉all就对了。
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