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59.He was ______ what to do.

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59.He was ______ what to do.
a.at his wit end b.at his wits end c.at his wit’s end d.at his wits’s end
请高手给个确切的答案,讲下集中的语法知识,再翻译下句子,
C at his wit's end wit = 不可数单词
算是一句英文惯用成语.等于是“不知道该怎么做尽管你绞尽脑汁”
一般如果单独的话就是 to be at one's wit's end
to be 就是is,was,are,were这些