He worked out the problem _easily_ (对划线部分提问)____ _____ he work out the problem?

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He worked out the problem _easily_ (对划线部分提问)____ _____ he work out the problem?

He worked out the problem _easily_ (对划线部分提问)____ _____ he work out the problem?
He worked out the problem _easily_ (对划线部分提问)
____ _____ he work out the problem?

He worked out the problem _easily_ (对划线部分提问)____ _____ he work out the problem?
How did he work out the problem