He was so busy that _____ I could say hello to him he had rushed out of the room.

A. when
B. before
C. since
D. until
B
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科目：高中英語 來源：0123 月考題 題型：單選題

He was so busy that _____ I could say hello to him he had rushed out of the room.
[     ]
A. when
B. before
C. since
D. until

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科目：高中英語 來源： 題型：

He was so busy that _____ I could say hello to him he had rushed out of the room．

       A．when         B．before         C．since D．until

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