Albert Einstein talked about what influenced his life as a scientist. He remembered seeing a pocket compass when he was five years old and (marveling/marveled) that the needle always pointed north.
This is from my exam question which asked to select the correct choice between marveling and marveled. The answer says marveling is the correct answer but it seems like marveled is the right answer for me. Can someone verify the answer and explain why marveling is correct?