Although the causes of cancer ________, we do not yet have any practical way to
题型：不详难度：来源：
Although the causes of cancer ________, we do not yet have any practical way to prevent it．| A．have uncovered | B．have been uncovering | | C．are uncovering | D．are being uncovered |
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答案
| D |
解析
| 考查时态语态，句意是;虽然癌症的原因正在被揭示出来，我们还是没有实用的方法来阻止它，因为癌症是被揭示，用被动式，几个选项只有A是现在进行时的被动。选D。 |
举一反三
John had to have his car repaired in a garage because it seriously.| A．damaged | B．was being damaged | C．had damaged | D．had been damaged |
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We first met on a train in 2000．We both felt immediately that we _____ each other for years.| A．knew | B．have known | C．had known | D．know |
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The mother who lost her son insisted that the careless driver for the traffic accident ___ yesterday .| A．was to blame ; happening | B．be to blame ; happened | | C．be blamed ; was happened | D．was to blame; had happened |
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The manner in which a telephone is answered gives the image of the organization, so
polite and pleasant when answering the telephone.| A．being | B．be | C．to be | D．having been |
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—If he , he that food.
—Luckily he was sent to the hospital immediately.| A．was warned, would not take | B．had been ,warned, would not have taken | | C．would be warned, had not taken | D．would have been warned, had not taken |
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