Mark the letter A,B,C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions I posted the letter. I realized that I had forgotten to put on a stamp. A. Only after posting the letter did I realize that I had forgotten to put on a stamp B. Hardly had I realized that I had forgotten to put on a stamp when I posted the letter C. Not only did I realize that I had forgotten to put a stamp on the letter but I posted it as well D. No sooner had I posted the letter than I forgot to put on a stamp

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