All ______ is a continuous supply of raw materials.A、what is neededB、thing need

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问题 All ______ is a continuous supply 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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