题文
He was observed ________ into the house before the owner came back.
| A．to slip |
| B．slip |
| C．slipping |
| D．slipped |
推荐试卷
He was observed ________ into the house before the owner came back.
| A．to slip |
| B．slip |
| C．slipping |
| D．slipped |
试题篮
()
粤公网安备 44130202000953号
