It was playing computer games that cost the boy plenty of time he ____ doing hi
题型：不详难度：来源：
It was playing computer games that cost the boy plenty of time he ____ doing his lessons.| A．might have spent | B．ought to have spent | C．must have spent | D．could have spent |
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答案
| B |
解析
| 本题考查的是虚拟语气的有关用法。Ought to / should + have +p.p表示“本来应该做却没有做到的事情”，有责备的含义。 |
举一反三
John promised his doctor he ________ not smoke, and he has smoked ever since.| A．might | B．should | C．could | D．Would. |
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Thank you for all your hard work last week. I don’t think we _____ it without you. | A．can manage | B．could have managed | | C．could manage | D．can have managed |
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It is usually warm in my hometown in March, but it _____ be rather cold sometimes.| A．must | B．can | C．should | D．would |
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| You don’t have to know the name of the author to find a book. You ____find the book by the title. |
According to the air traffic rules, you______switch off your mobile phone before bearding.| A．may | B．can | C．would | D．should |
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