问题
选择题
| 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 |
答案
答案：B
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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 |
答案：B