--Shemusthavegonebacktothevalley.--No,she_______.Theentrancetoitwasn

发布时间：2020-08-04 17:16:28

--She must have gone back to the valley.--No, she _______. The entrance to it was nowhere to be found.A.mustn'tB.needn'tC.couldn'tD.hadn't

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C解析couldn't表示否定的推测。
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