I was about to leave the office ______ the telephone rang．So I stopped ______ it．A.when; to answerB.when; to replyC.while; answeringD.as; replying
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B解析考查短语搭配。be about to do sth. when...是固定搭配,正要做某事时,....发生了；stop to do停下来做。句意：我正要离开办公室的时候，突然电话响了。因此我停下来接它。