---Don"t put the waste on the ground. ---Oh, I"m very sorry. I ________ the dust
题型：不详难度：来源：
---Don"t put the waste on the ground.
---Oh, I"m very sorry. I ________ the dustbin（垃圾箱） there. | A．don"t see | B．isn"t seeing | C．didn"t see | D．haven"t seen |
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答案
| C |
解析
试题分析：考查时态：句意：--别把垃圾扔在地上。--哦，对不起，我没看见这里的垃圾箱。说明刚刚没看见垃圾箱，用一般过去时。选C。
点评：这道题的时态没有具体的时间，要根据上下文把隐含的时间找出来，做题就简单了。 |
举一反三
So far this year we ________ a fall in house prices by between 5 and 10 percent.| A．saw | B．had seen | C．have seen | D．see |
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______ of danger in the street at night, she had to go home, with a friend _____ her.| A．Warned ; accompanied | B．Warning; accompanying | | C．Having warned; accompanied | D．Having been warned; accompanying |
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Jack doesn’t smoke now, but he _______ for almost twenty years.| A．was smoking | B．had smoked | C．has smoked | D．smoked |
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He______on the farm for twenty years and now he is a teacher.| A．has worked | B．had worked | C．worked | D．works |
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