Question

I was _________ writing to him when he telephoned to me saying that he would come to see me on National Day．

1. A.
   thinking of
2. B.
   about to
3. C.
   just thinking
4. D.
   thinking about

Answer 1

A
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”。