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they were respectively puzzled at what each revealed.

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they were respectively puzzled at what each revealed.
他们彼此迷惑于发现的彼此.这里at what作为什么用啊,为什么what前面加at?what 能不能用which代替,what引导什么从句,又在从句里作什么成份?
they were respectively puzzled at what each revealed.
at what 不是连在一起的.
at是puzzled at what引导的是宾语从句 做的是从句里的宾语.所以不能用which代替