A-A+ It was so cold that they kept the fire ______ 2022-08-06 07:21:28 问答库 阅读 177 次 问题详情 It was so cold that they kept the fire ______ all night. A. to burn B. burn C. burning D. burned 参考答案 正确答案：C 19．答案为C keep+动词ing为一习惯句型，“使……保持某一状态”。
