I was _________ writing to him when he telephoned to me saying that he would e to see me on National Day．A.thinking ofB.about toC.just thinkingD.thinking about
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A解析句意：我正想到要给他写一封信，这时他打电话来说要在国庆节来看我。要注意：was about to后面是不定式，与when连用时，表示“正想做某事，这时发生了另一件事”。