この漢字の読み方を___ください。 (Please tell me how to read this kanji.)

Answer and explanation

Correct answer: D. 教えて

て-form plus ください is a polite request.
Answer: 教えて.
Why not the others: 教える: ください needs the て-form. 教えた: ください needs the て-form. 教えない: that would say please do not teach.

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