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()Yesterday morning I was just about to leave ___ to telepho

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()Yesterday morning I was just about to leave ___ to telephone rang.
A when B while
()Yesterday morning I was just about to leave ___ to telepho
A
when和while 还可作并列连词.when表示“在那时”;while表示“而,却”,表对照关系.如:
a.The children were running to move the bag of rice when they heard the sound of a motor bike.
孩子们正要跑过去搬开那袋米,这时他们听到了摩托车的声音.
b.He is strong while his brother is weak.
他长得很结实,而他弟弟却很瘦弱