---Who has made a mess in my room?---Who else it but your naughty son?A．co
题型：不详难度：来源：
---Who has made a mess in my room?
---Who else it but your naughty son?| A．could do | B．could have done | C．did | D．has done |
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答案
| B |
解析
| 考查情态动词用法。语境表示对过去发生并延续到现在的情况的推测，用could have done表示不肯定的语气。 |
举一反三
---Good morning，Doctor Brown’s office.
---Hello, this is Tom Smith. Could you please tell Doctor Brown I ?
My car start.| A．was delayed, doesn’t | B．will be delayed, won’t | | C．am delayed, didn’t | D．would delay, mustn’t |
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—When can I come for the photos？I need them tomorrow afternoon.
—They _____ be ready by 12p. m. | A．can | B．should | C．might | D．need |
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—Would you lend me your pen for a while？
—Certainly. I _____. | A．would | B．should | C．will | D．shall |
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—Shall I tell John about it？
—No, you _____ ,I"ve told him already. | A．needn"t | B．won"t | C．mustn"t | D．shouldn"t |
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Although James Cook the first westerner to have discovered Australia,New Zealand and Hawaii,his travels led to the creation of more accurate and reliable maps for vast parts of the world.| A．isn’t | B．wasn’t | | C．must have been | D．may not have been |
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