手を洗っ___、ご飯を食べましょう。
Q. Which connective means 'after washing hands'?
Translation
Let's eat after washing our hands.
Explanation
Te-form + から expresses 'after doing X (then Y)': 洗ってから食べましょう. たあとに needs the plain past (洗ったあとに) — it cannot attach to 洗っ directly.