题目列表(包括答案和解析)
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
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
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
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 |
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
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