问题 选择题
They were all very tired, but _______ of them took a rest.
A.noneB.allC.bothD.either
答案

A

考查不定代词的用法。并列句的前面有all,说明超过二人,排除C、D选项;连词用了but,有转折的意思,说明累却不休息,因此后面要用否定词。故选A。

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