他们不可能飞往了巴黎，护照还放在桌子上呢。
They cannot have flown to Paris—their passports are still on the table.
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cannot英 /ˈkænɒt/|美 /ˈkænɑt/|英 /kəˈnɒt/|美 /kəˈnɑt/
flown英 /fləʊn/|美 /floʊn/
解释
cannot have + flown 构成情态动词完成体，表达对过去情况的否定推测：说话人根据当前可见证据（护照在桌上）推断出行不可能已经发生。
They cannot have flown to Paris—their passports are still on the table.
cannot have + flown 构成情态动词完成体，表达对过去情况的否定推测：说话人根据当前可见证据（护照在桌上）推断出行不可能已经发生。