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        1. _ I was_______ the point of telephoning him when his letter arrived.
          A.inB.toC.a(chǎn)tD.on
          D
          考查介詞。on the point of doing sth.是固定搭配,另外注意這個句子中并列連詞when連接的固定句型:on the point of doing...when...,意思是“正要干……這時……”,這樣的句型還有 be about to do...when...,was doing...when...。
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