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1) 并列结构中,or通常用于否定句,and用于肯定句。

2) 但有时and 也可用于否定句。请注意其不同特点:

   There is no air or water in the moon.
   There is no air and no water on the moon.

  在否定中并列结构用or 连接,但含有两个否定词的句子实际被看作是肯定结构,因此要用and。

典型例题

---I don't like chicken ___ fish. 
---I don't like chicken, ___ I like fish very much.

A. and; and
B. and; but
C. or; but
D. or;and

  答案C。否定句中表并列用or, but 表转折。

判断改错:(错)We will die without air and water.
(错)We can't live without air or water.
(对)We will die without air or water.
(对)We can't live without air and water.
 
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