27. The boy was busy doing his homework, only_____once in a while to look out of the window.
| A．stopping | B．to stop | C．stopped | D．having stopped |
相关知识点
推荐试卷
27. The boy was busy doing his homework, only_____once in a while to look out of the window.
| A．stopping | B．to stop | C．stopped | D．having stopped |
试题篮
()
粤公网安备 44130202000953号
