he has no difficulty ---------（work）out the problem .为什么答案working

he has no difficulty ---------（work）out the problem .为什么答案working
he has no difficulty ---------（work）out the problem .
为什么答案working

he has no difficulty ---------（work）out the problem .为什么答案working
固定搭配
have no difficulty doing sth 做某事没有困难
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