Looking at the pattern "__a_t", common 4-letter words with 'a' in second position and ending with 't' include "what", "chat", "that", etc. The letter 'h' appears frequently in such words, particularly in the first or third position. Since I've already correctly guessed 'a' and 't', and 'e' was incorrect, 'h' seems like a high-probability letter to try next.