Walking exercise may be boring ____________, but early on a clear sunny morning there can be nothing...
2022-11-18 14:06:38 15次 2016届江苏南菁高中实验学校九年级5月模拟英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Walking exercise may be boring ____________, but early on a clear sunny morning there can be
nothing finer.
A. in time B. on time
C. at times D. some time
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