题文
At the beginning of the class, the noise of doors__________ could be heard many times.
| A．opened and closed |
| B．to be opened and closed |
| C．being opened and closed |
| D．to open and close |
推荐试卷
At the beginning of the class, the noise of doors__________ could be heard many times.
| A．opened and closed |
| B．to be opened and closed |
| C．being opened and closed |
| D．to open and close |
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