---How much vinegar did you put in the soup?---I’m sorry to say, ______. I forget.A.noB.no oneC.nothingD.none
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D解析本题考查不定代词的本意区别及其与语境综合运用。此处none指的是not any vinegar，也就是说，此处可以这样理解：I’m sorry to say that I didn’t put any vinegar in the soup, because I forgot it.