Walking exercise may be boring ________, but doing it on a clear sunny early morning can be nothing ...
2022-11-15 03:57:15 168次 江苏省无锡市新吴区2017届九年级下学期一模考试英语试卷 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 doing it on a clear sunny early morning can be nothing
finer.
A. in time B. at a time C. at times D. some time
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