题目内容
12．Bob and David are friends．__________ of them work in the art club as volunteers．（ ）| A． | All | B． | Both | C． | Each | D． | Every |
分析 鲍勃和大卫是朋友，他们两个都在艺术俱乐部做志愿者．
解答 答案：B 根据前句主语Bob and David可知，后句是说"他们两个"A all全部；B both两个都；C each每一个；D every后面需要跟名词，每个．故选B．
点评 判断使用哪个不定代词，主要是根据本句的主语．还要注意几个不定代词的含义．
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