Jack_____out very early, for he had not shown up at breakfast.

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问题 Jack_____out very early, for he had not shown up at breakfast.

选项 A、could have gone
B、must have gone
C、ought to have gone
D、should have gone

答案B

解析考查“情态动词+完成式”的用法。根据句意应选B，因为must have done表示对过去事情的肯定推测。C和D中should／ought to have done都表示本应该做某事却没有做：A中couldhave done表示本可以做某事却没有做，均不符合题意。

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