题目内容
13．-When shall we meet，this Saturday or Sunday？-________is OK．I'm free these days． （ ）
| A． | Both | B． | Either | C． | All | D． | Neither |
分析 --我们什么时间碰头，这个周六还是周日？--那一天都可以．我这些天有空．
解答 答案：B．both意思是"两者都"作主语时谓语动词用复数；either意思是"两者中的任何一个"作主语谓语动词用单数；all意思是"三者或三者以上都"作主语时谓语动词用复数；neither意思是"两者都不"作主语谓语动词用单数．根据"this Saturday or Sunday"要从两者中进行选择，又根据"______is OK．I'm free these days．"可知这两天中的哪一天都可以，所以要用either，故选B．
点评 首先要掌握这四个不定代词的意思以及用法，然后结合具体的句意，就可以确定正确答案．
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