I was_______ the point of telephoning him when his letter arrived.A.inB.toC.atD.on
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D解析考查介词。on the point of doing sth.是固定搭配，另外注意这个句子中并列连词when连接的固定句型：on the point of doing...when...,意思是“正要干……这时……”，这样的句型还有 be about to do...when...,was doing...when...。