问题描述：
i have to turn to my teacher for help,because this math problem is rather .
i have to turn to my teacher for help,because this math problem is rather difficult to work out
为什么是work out而不是be worked out?这个词组有被动语态啊
i have to turn to my teacher for help,because this math problem is rather difficult to work out
为什么是work out而不是be worked out?这个词组有被动语态啊
问题解答：
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