Tin: When did you become a minimalist? Sam: I a minimalist since I from university.

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Tin: When did you become a minimalist?

Sam: I ______ a minimalist since I ______ from university.

became – had graduated

was becoming – graduated

become – have graduated

have become – graduated

Giải thích

Ta thấy since => thì hiện tại hoàn thành

Cấu trúc: S + have/has + P2 since + S + V2/ed

=> Chọn have become – graduated

Dịch: Tin: Khi nào cậu trở thành người theo chủ nghĩa tối giản?
Sam: Tớ đã trở thành người tối giản kể từ khi tớ tốt nghiệp đại học.

Tin: When did you become a minimalist? Sam: I ______ a minimalist since I ______ from university.