情态动词问题：----We didn't see him at the lecture yesterday.----He ____ it.A.mustn't attend
1.----We didn't see him at the lecture yesterday.
----He ____ it.
A.mustn't attend B.cannot have attended C.would have not attended D.needn't have attended
2.You ____ your lessons yesterday,but you didn't.
A.had gone over B.should have gone over C.should go over D.would go over