Jack kept in touch with his friends ((by e-mail)(划线))during his stay in America.(对划线部分提问)_ _Jack keep in touch with his friends during his stay in America?

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Jack kept in touch with his friends ((by e-mail)(划线))during his stay in America.(对划线部分提问)
_____ _____Jack keep in touch with his friends during his stay in America?

How did Jack keep in touch with his friends during his stay in America?

Jack kept in touch with his friends ((by e-mail)(划线))during his stay in America.(对划线部分提问)_____ _____Jack keep in touch with his friends during his stay in America?

Jack kept in touch with his friends ((by e-mail)(划线))during his stay in America.(对划线部分提问)_ _Jack keep in touch with his friends during his stay in America?