It's really a wonder that all the passengers on board____while the plane itself sank into the riverA.must have been saved B.should have been saved选哪一个?

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It's really a wonder that all the passengers on board____while the plane itself sank into the riverA.must have been saved B.should have been saved选哪一个?

It's really a wonder that all the passengers on board____while the plane itself sank into the riverA.must have been saved B.should have been saved选哪一个?
It's really a wonder that all the passengers on board____while the plane itself sank into the river
A.must have been saved B.should have been saved
选哪一个?

It's really a wonder that all the passengers on board____while the plane itself sank into the riverA.must have been saved B.should have been saved选哪一个?
个人认为是B 后面that引导的主语从句应该使用虚拟语气 表示一种惊讶的感情
因为前面说了It's really a wonder