.We were all waiting for you .You _____for the seaside by yourself without leavi
题型：不详难度：来源：
.We were all waiting for you .You _____for the seaside by yourself without leaving a message.| A．mustn’t leave | B．shouldn’t have left | C．couldn’t have left | D．needn’t leave |
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答案
| B |
解析
| 这是情态动词的特殊用法，shouldn’t have left表示本来不应该做但实际已经做了。 |
举一反三
She is late. What _____have happened to her?
A should B must C can D would |
----She must have gone back to the valley.
----No, she _____. The entrance to it was nowhere to be found.
A mustn’t B needn’t C couldn’t D hadn’t |
| A．may not be | B．won’t be | C．couldn’t be | D．mustn’t be |
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“Do you think he is lazy?” “I _________ so once, but I don’t now.”| A．may have thought | B．can have thought | C．may think | D．might think |
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You _________ be right, but I don’t think you are.| A．can | B．could | C．must | D．should |
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