— Someone is knocking at the door. Who can _____ be?
| — Someone is knocking at the door. Who can _____ be? — I will go and answer it. |
| [ ] |
| A. she B. they C. he D. it |
可能相似的问题
| — Someone is knocking at the door. Who can _____ be? — I will go and answer it. |
| [ ] |
| A. she B. they C. he D. it |