when did she begin to do research on lung cancer? How long
2 câu trả lời
->How long has she done research on lung cancer?
Dịch: Bao lâu rồi cô ấy làm nghiên cứu ung thư phổi?
Dùng thì HTHT
How long+have/has+S+V3/Ved+...?
=When+did+S+begin/start+to V/V_ing+....?
When did she begin to do research on lung cancer?
`to` How long has she begun to do research on lung cancer?
Cấu trúc: When did+ S+ V-inf?
`to` How long+ have/ has+ S+ Vp2?
