He failed the final examination and only then how much time he had wasted.A. he realized B. had he realizedC. he had realized D. did he realize 题目和参考答案——青夏教育精英家教网—

题目内容

He failed the final examination and only then ____ how much time he had wasted.

A. he realized B. had he realized

C. he had realized D. did he realize

【解析】

试题分析：考查倒装句。句意：他期末考试不及格，并且只有在那时他才意识到他浪费了多少时间。题干中and后的分句使用的是“Only + 副词 + 助动词 +主语 + 动词 + 其他”的句型结构，语境是过去时，他意识到也是发生在过去，故选D。

考点：考查倒装句

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1.英语容易学。你可以通过多阅读取得进步。（主语+ be +adj + to do, by doing）

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3.他还没到场，可能发生了什么事？（turn up, could have happened）

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4.他说的不可能是真的。他可能正在撒谎。(must be doing)

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5.我们正要启程这是下雨了（be about to do…when）

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6.是老师帮助取得这么大的进步。（强调句）

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7.学英语使我们和外国人交流成为可能。（make it possible for sb to do）

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They ________that immediate action be taken to stop the water pollution .

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Although a temperature rise of 2° may not seem significant, the local effects may be much greater: in polar regions a rise of 10° by 2025 is expected and in Northern Europe a rise of 4°. Indeed the first effects were expected to be felt before the end of the 20th century.

But how does the “greenhouse effect” operate and why should such a tiny proportion (比例) of CO2 have such a harmful effect? When living creatures breathe out or when things are burned, CO2 enters the atmosphere. Until recently all of this was absorbed by plants, which converted (转化) it back into oxygen.

However, the balance of nature has been disturbed. In power stations, in factories and in our cars, we are burning more and more fossil fuels (coal, oil and natural gas) and this produces huge quantities of CO2—18 billion tons of it enter the atmosphere every year. Added to this, the destruction of forests means that less CO2 can be converted into oxygen by plants. So, the amount of CO2 in the atmosphere is increasing every year.

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A. Only a small portion of the atmosphere consists of carbon dioxide.

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2.The amount of CO2 in the atmosphere is increasing every year because .

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When we were in the middle of the lake, a wind came all of a sudden. The boat was hit hard. Dad was always at his best in any , but at this moment he was .

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In my memory he could fix any problem. He was the one I always for power and safety . Before I could respond, a of water got into the boat. I rushed to the tiller it was too late. Another huge wall of water the boat in a minute. We were thrown into the water, and Dad was struggling aimlessly. At that moment, I felt strongly protective of him.

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2.A. unforgivable B. unforgettable C. cheerful D. thankful

3.A. sent B. ordered C. invited D. allowed

4.A. calm B. icy C. stormy D. thundery

5.A. finished B. went C. seemed D. sounded

6.A. strong B. gentle C. cold D. hot

7.A. danger B. place C. sport D. job

8.A. suffered B. fell C. frightened D. moved

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Proof-reading (10%)

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