The boy the first prize, but he was so careless as to make a foolish mis
题型：不详难度：来源：
The boy the first prize, but he was so careless as to make a foolish mistake.| A．must have gained | B．need have gained | | C．could have gained | D．shall have gained |
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答案
| C |
解析
| 考查情态动词。must have done 对过去事情肯定的推测，一定，need have done 本需要做某事，而实际上没有做，could have done 本可以做某事，而实际上没有做，句意：这个男孩本可以获得第一名的，但是实际上没有做。故选C。 |
举一反三
He did not regret saying what he did but felt that he _________ it differently. | A．could express | B．would express | | C．could have expressed | D．must have expressed |
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Despite the fact that his scores were good, they were hardly as excellent as a student with his intelligence .| A．achieved | B．had achieved | | C．would achieve | D．should have achieved |
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| The weather ________ be very cold at times, though it’s usually warm in spring in my home-town. |
You ______be sitting in this waiting room, sir. You see, it is for women and children only.| A．oughtn’t to | B．dare not | C．need not | D．will not |
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---Do you know where David is? I couldn’t find him anywhere.
---Well. He ______ have gone far----his coat’s still here.| A．shouldn’t | B．mustn’t | C．can’t | D．wouldn’t |
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