My brother often ____(surfed;surfing)the Internet when he was in _英语解答

My brother often ____(surfed;surfing)the Internet when he was in university.选择正确一项

人气：417 ℃　时间：2019-10-23 08:40:22

解答

答案是：surfed
因为
surfing 不能作谓语
加油!不明白再问!