_ 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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