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Yesterday morning I was just leaving_______ the telephone rang.
A.whenB.whileC.becauseD.since
A

试题分析:句意:昨天早上我正要离开时电话铃响了。When当…时;while当……时; because 因为;since自从。表示某事正在进行时发生了另一件事,常用when,所以选A。
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