John can work out this math problem easily 改为被动语态 This math problen _____ _____ ______ _____John can work out this math problem easily 改为被动语态This math problen _____ _____ ______ _____ out by john

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John can work out this math problem easily 改为被动语态 This math problen _____ _____ ______ _____
John can work out this math problem easily 改为被动语态
This math problen _____ _____ ______ _____ out by john

This math problen can be easily worked out by John

could be easily worked