题目内容
He was just leaving ________ the telephone rang．
| A．while | B．when | C．as | D．until |
B
解析试题分析: 句意：电话响的时候，他正要离开。while当……的时候（主、从句动作同时发生，延续性动词），when 当……的时候（动词可为延续性动词和瞬间动词），as一边……一边，until直到（主句用延续性动词）；leave离开，瞬间动词用进行时表将来时，故选B。
考点：考查连词
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