题文
Having checked the doors were closed, and all the lights were off, the boy opened the door to his bedroom.
| A．why |
| B．that |
| C．when |
| D．where |
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Having checked the doors were closed, and all the lights were off, the boy opened the door to his bedroom.
| A．why |
| B．that |
| C．when |
| D．where |
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