题目内容
7．I don't have a sister _______ a brother．There is only one child in my family．（ ）| A． | and | B． | or | C． | either | D． | but |
分析 我既没有姐姐也没有哥哥，在我家里只有一个孩子．
解答 答案：B．
and意思是"和"经常用于肯定句中；or意思是"和，或者"经常用于否定句中；either意思是"两者中的任何一个"；but意思是"但是"根据"There is only one child in my family．"在我家里只有一个孩子．因此可知上一句话的意思是"我既没有姐姐也没有哥哥，"这是一个否定句，因此在否定句中我们要用or来表示"和"综上所述，故选B．
点评 首先要掌握这几个连词的意思，然后结合具体的题目，就可以确定正确答案．
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