他们不可能提前知道考题——试卷是昨晚才印出来的。
They couldn't have known the exam questions in advance — the papers were only printed last night.
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couldn't英 /ˈkʊdnt/|美 /ˈkʊdnt/
have英 /əv/|美 /əv/
known英 /nəʊn/|美 /noʊn/
解释
用 couldn't have known 对过去知晓状态做否定推测，以试卷印制时间作为物理上不可能提前知晓的依据。
They couldn't have known the exam questions in advance — the papers were only printed last night.
用 couldn't have known 对过去知晓状态做否定推测，以试卷印制时间作为物理上不可能提前知晓的依据。