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Câu hỏi:
When Jane Luu ________ as a graduate student at MIT, David Jewitt ________ there as a professor.
- A. enrolled - was working
- B. was enrolling - had worked
- C. had enrolled - was working
- D. enrolled - has worked
Lời giải tham khảo:
Đáp án đúng: A
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- When Jane Luu ________ as a graduate student at MIT, David Jewitt ________ there as a professor.
