It's difficult for him to work out this maths problem 同义句是什么 He开头

问题描述:

It's difficult for him to work out this maths problem 同义句是什么 He开头
同义句的空格是这样 He [][ ][] out this maths problem

He [ has ] [ difficulty ] [ working ] out this maths problem
have difficulty (in)doing 做……有困难