题目

John promised his doctor he        not smoke, and he has never smoked ever since. A.might              B.should          C.could                  D.would   答案: D   句意为:约翰答应医生他不再吸烟,从那以后,他再也没有吸过烟。由句意可知空格处表示允诺,故应选择D项。  
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