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试题详情及答案解析: We have to discuss this question.
A. enough time; enough difficult
B. time enough; difficult enough
C. enough time; difficult enough; 答案：C; 试题分析：句意：我们有足够的时间来讨论这个足够难的问题。Enough修饰名词时，可前可后，修饰形容词和副词时只能后置，所以此题选C。
考点：考查enough的用法