问题
选择题
| — ______ is the old man over there? — My grandfather. |
| A. Which B. What C. Who D. Whose |
答案
答案：C
搜题请搜索小程序“爱下问搜题”
| — ______ is the old man over there? — My grandfather. |
| A. Which B. What C. Who D. Whose |
答案：C
池水，如果按开2个进水管、排水孔、3个进水管、排水孔、4个进水管、排水孔……的顺序轮流各开1小时，多长时间后水池的水刚好排完（）