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2. [2014 '重慶卷]It was John who broke the window.  Why are you talking to me as if I    it?

A. had done    B.  have done

C. did       D.  am doing

2.    A 4查虛擬語氣。as if后的句子若表示與事實相反,需要用虛擬語氣。根據(jù)前一句中謂語動詞用一般過去時可知,as if后的句子表示的是與過去事實相反的假設(shè),用過去完成時。故選A。

題目來源:2015全品語法快練高中英語新課標(biāo) > 訓(xùn)練29動詞變化類綜合訓(xùn)練

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科目:高中英語 來源: 題型:

C

Now, we know that if we do not get enough vitamins, we are at the risk of devel?oping a number of diseases. As a result, vita?min supplements(補品),though expensive, are popular with people who worry that they are not get?ting enough vitamins from the foods they eat. But contrary to what many people think,medical experts have found lit?tle evidence that most supplements do anything to improve health or protect against diseases.

In fact, medical experts warn that taking too many of some vitamins can be harmful. For example*too much vita?min E can cause bleeding. People should discuss what vita?mins they take with their doctors, as some vitamins can produce harmful side effects when mixed with medicines.

Experts, however, do say that sometimes vitamins can help prevent diseases. People who know they lack a particular vitamin should take vitamin supplements. Some older adults, for example, may not have enough vitamin twelve. This is because, as people get older, their body loses its ability to take it from foods. Also, people who spend much time in?side may need some extra vitamin D as the skin makes this vitamin from sunlight.

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