All we need is to be supplied with food and clothing.A. whatB. thatC. whichD. whom

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A. what
(答案→)B. that
C. which
D. whom
解析：考查定语从句。当先行词是all表示所有物的时候，用关系动词that指代all，that在句中做need的宾语。句意：我们需要的所有东西就是是有食物和水的供应。