While the tourists _____ at the breathtaking scenery, a local guide explained the history of the heritage site. marvel marveled were marveling are mar5/111While the tourists _____ at the breathtaking scenery, a local guide explained the history of the heritage site.marvelmarveledwere marvelingare marveling ---------------Giải thích-- Bạn chưa nhập giải thích --