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----She must have gone back to the valley.
----No, she _____. The entrance to it was nowhere to be found.
A mustn’t     B needn’t   C couldn’t   D hadn’t
C
must have gone表示對(duì)過(guò)去事情的肯定推測(cè)，答話了否定的，所以這里用couldn’t表示不可能。
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