不可以,语法上来说enough应该在形容词后面：difficult enough
另外不要用中文的思维,虽然意思可以是“题目足够困难”,但也用enough也不合适,too..to是固定搭配
some maths problems in this book are __difficult for the studentsto work out
some maths problems in this book are __difficult for the studentsto work out
可以填enough
可以填enough
英语人气：848 ℃时间：2019-10-11 14:42:24
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