offer的过去式是加ed还是双写r加ed?offered还是offerrd?

offer的过去式是加ed还是双写r加ed?offered还是offerrd?
offer的过去式是加ed还是双写r加ed?
offered还是offerrd?

offer的过去式是加ed还是双写r加ed?offered还是offerrd?
offer重音在前面的o上,无须双写r,所以是offered

ed

直接加ed

当然是offered。