He________________________(成为一名工程师)when he left university.He____ _____ _____ (成为一名工程师)when he left university.

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He________________________(成为一名工程师)whenheleftuniversity.He______________(成为一名工程师)whenheleftuniversit

He________________________(成为一名工程师)when he left university.He____ _____ _____ (成为一名工程师)when he left university.
He________________________(成为一名工程师)when he left university.
He____ _____ _____ (成为一名工程师)when he left university.

He________________________(成为一名工程师)when he left university.He____ _____ _____ (成为一名工程师)when he left university.
had been an engineer
became an engineer