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Which sentence correctly expresses that a teacher had extensive experience before a promotion?

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This question belongs to "Thì quá khứ hoàn thành – Past Perfect" on Học Mỗi Ngày. Review the answer, solution, and related items in the same set to study more effectively.

Question detail

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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