为何要加逗号呢? A, B and C的结构只需要A和B之间加逗号啊. -- by 会员 aeoluseros (2012/5/20 20:11:26)
斑竹,下面都是A, B, and (or) C的例子。 OG-15: Warning that computers in the United States are not secure, the National Academy of Sciences has urged the nation to revamp computer security procedures, institute new emergency response teams, and create a special nongovernment organization to take charge of computer security planning. OG-17 The commission has directed advertisers to restrict the use of the word “natural” to foods that do not contain color or flavor additives, chemical preservatives, or anything that has been synthesized. -- by 会员 mongmong (2012/5/23 15:27:03)
嗯~这里加逗号是有它们各自特别的原因的。 第一个句子:通常A,B,C三者并列,如果三者有一者以上过长,或者包括了verb,GMAT偏向于在and前加逗号。 第二个句子or anything前加逗号是为了更加清晰,防止人们读的时候以为是和"color or flavor"一样的结构。
==
mongmong再思考下,其实我说的所有东东,都是从这句话里推导出来的:句式简洁,结构清晰,语义单一而精准 注意“结构清晰” |