Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is best written from the given cues in each of the following questions. Khanh/have/take/ a course/improve/ Engl

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Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is best written from the given cues in each of the following questions.

Khanh/have/take/ a course/improve/ English?

Khanh had to take a course to improve of her English, wouldn't she?

Khanh had to take a course to improve her English, hadn't she?

Khanh had to take a course to improve her English, didn't she?

Khanh had to take a course improving her English, wasn't she?

Giải thích

C. Khanh had to take a course to improve her English, didn't she?