How many letters do you have to enter for the auto-complete to work? 10/31/2018 – by Mod_GuideK 0 How many letters do you have to enter for the auto-complete to work? A. 1 B. 2 C. 3 D. 4 SHOW ANSWERSCorrect Answer: A Explanation/Reference: Explanation/Reference: Auto complete will begin to auto prompt on the first keystroke. Download Printable PDF. VALID exam to help you PASS.