He ________ (毫不费劲)working out the problem

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He ________ (毫不费劲)working out the problem

He ________ (毫不费劲)working out the problem
He ________ (毫不费劲)working out the problem

He ________ (毫不费劲)working out the problem
had no difficulty in

He make light work of working out the problem.