She told me his name after he ___.

had left সঠিক। বাক্যটি: She told me his name after he had left.

• Past Indefinite + after + Past Perfect: যদি after-এর আগের অংশ Past Indefinite হয়, তবে পরের অংশ Past Perfect হবে।
• Present Indefinite বা Future Indefinite + after + Present Perfect।

Example: The train left after he had reached the station.