| 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 |
科目：高中英語 來源：0123 月考題 題型：單選題
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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