答案：A

考察句型，spend time/money on sth/ doing sth，该部分we once spent so much time on 作The farm as well as its neighboring hills的定语，has taken a new look recently,是主句的谓语动词，

句意为，我们曾经花了很多时间待过的农场和农场周围的小山最近呈现出了一个新的面貌。