作业帮He couldn't work out the math problem.(改为同义句) He ____ ____ ____work out the math problem.
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He couldn't work out the math problem.(改为同义句) He ____ ____ ____work out the math problem.
He couldn't work out the math problem.(改为同义句) He ____ ____ ____work out the math problem.
He couldn't work out the math problem.(改为同义句) He ____ ____ ____work out the math problem.
He hardly ever work out the math problem
He wasn't able to work out the math problem