______ you go across the road, you must be careful.
| ______ you go across the road, you must be careful. |
| [ ] |
| A. Since B. After C. When D. Before |
可能相似的问题
你能帮帮他们吗
| ______ you go across the road, you must be careful. |
| [ ] |
| A. Since B. After C. When D. Before |
你能帮帮他们吗