问俩情态动词的题

题目

问俩情态动词的题
1.Look!jack's fallen asleep.
oh,he( )too late last night.
A.might sit up
B.must have sat up
C.could sit up
D.should have sat up
2.Your parents were really worried about you.( )home without a word.
A.shouldn't leave
B.mustn't leave
C.shouldn't have left
D.couldn't have left

答案

1.Look!jack's fallen asleep.
oh,he( must have sat up)too late last night.
2.Your parents were really worried about you.You( shouldn't have left)home without a word.
第一个句子情态动词must表示一种推测,而且肯定的程度很高；
第二个句子should have(not) do sth.是过去完成时,不应该做了某事（但是已经做了）.