题目内容
15．I have three sisters．________of them are doctors．（ ）| A． | None | B． | Both | C． | Neither | D． | Either |
分析 我有三个姐姐．他们都不是医生．
解答 答案为A．none没有一个； both两者都； neither（两者中）任何一个都不；．either（两者中）任何一个．因为neither和either是指两者中之一，又因为题干中有 three sisters，故可排除选项B，C和D．故答案为A．
点评 明确各选项词汇的意义及用法，结合语境即可知答案．
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