The problem is too difficult for________of us to work out．A.someoneB.nobodyC.anyD.everyone
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C解析分析：本句的关键点在于句子是否定含义，too…to…意思是“太……以致不能……”，是否定结构中用any．any of us表示“我们中任何一个人”。原句可以改为：The problem is so difficult that none of us can work it out．(延伸)使用这些复合不定代词时，不能直接加of结构，所以不能说anybody of us，要说any of us；错：nobody of us，对：none of us；everyone of us应改为every one of us．