他们不可能事先知道答案——题目是今天早上才出的。
They couldn't have known the answer beforehand — the question was only written this morning.
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couldn't英 /ˈkʊdnt/|美 /ˈkʊdnt/
have英 /əv/|美 /əv/
known英 /nəʊn/|美 /noʊn/
解释
couldn't have known 表示对过去认知的否定推测——出题时间为据，证明对方不可能事先知道答案。
They couldn't have known the answer beforehand — the question was only written this morning.
couldn't have known 表示对过去认知的否定推测——出题时间为据，证明对方不可能事先知道答案。