You are ______ out all the difficult problems.
A.enough clever work
B.enough clever to work
C.clever enough to work
D.clever enough work
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C解析考查enough的用法。enough修饰形容词必须放在形容词后，修饰名词时放在名词的前面或后面都行，一般是放名词前；故排除A、B；固定句型：形容词+enough +to do sth.“足够......可以做某事。”句意“你足够聪明，可以算出所有的难题。”故选C。