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