Chuyên đề 9: Hình thức phân từ
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:___________ in the hospital for 4 years,he decided to give up his work. A. Having worked B. Working C. Being working D. Worked

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___________ in the hospital for 4 years,he decided to give up his work.

Having worked

Working

Being working

Worked

Giải thích

Chọn A