Which sentence correctly expresses that a teacher had extensive experience before a promotion?
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Câu hỏi thuộc học liệu "Thì quá khứ hoàn thành – Past Perfect" trên Học Mỗi Ngày. Bạn có thể xem đáp án, lời giải và các câu liên quan trong cùng đề để ôn tập hiệu quả hơn.
Chi tiết câu hỏi
Which sentence correctly expresses that a teacher had extensive experience before a promotion?
A
Mrs. Crush was a teacher when she became head teacher.
B
Mrs. Crush has been a teacher before she became head teacher.
C
Mrs. Crush had been a teacher for twenty years before she became head teacher.
D
Mrs. Crush is a teacher for twenty years before she became head teacher.
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