I didn't see him yesterday afternoon,He ------have attended it选择:A couldn't B;can't 回答要著名的理由哦

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I didn't see him  yesterday afternoon,He ------have attended it选择:A   couldn't B;can't  回答要著名的理由哦

I didn't see him yesterday afternoon,He ------have attended it选择:A couldn't B;can't 回答要著名的理由哦
I didn't see him yesterday afternoon,He ------have attended it
选择:A couldn't B;can't
回答要著名的理由哦

I didn't see him yesterday afternoon,He ------have attended it选择:A couldn't B;can't 回答要著名的理由哦
这句的could have done是虚拟语气,意思是 他(昨天)不可能出席(活动)的

A
表示对过去的推测