Jack__be in class yesterday.A.didn't B.couldn't 选哪个?为什么?

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Jack__beinclassyesterday.A.didn''tB.couldn''t选哪个?为什么?Jack__beinclassyesterday.A.didn''tB.couldn''t选哪个?为什

Jack__be in class yesterday.A.didn't B.couldn't 选哪个?为什么?
Jack__be in class yesterday.A.didn't B.couldn't 选哪个?为什么?

Jack__be in class yesterday.A.didn't B.couldn't 选哪个?为什么?
B.couldn't
did; didn't 后面都不能跟be