7.Although the causes of cancer ____， we do not yet have any practical way to pr
题型：不详难度：来源：
7.Although the causes of cancer ____， we do not yet have any practical way to prevent it. | A．are being uncovered | B．have been uncovering | | C．are uncovering | D．have uncovered |
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答案
| A |
解析
| 分析语境逻辑不难发现，该空表示“现在正在被揭示”，应填现在进行时被动语态动词形式are being uncovered。 |
举一反三
8.Customers are asked to make sure that they ____ the right change before leaving the shop. | A．will give | B．have been given | | C．have given | D．will be given |
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Although the causes of cancer ____we do not yet have any practical way to prevent it.| A．are being uncovered | B．have been uncovering | | C．are uncovering | D．have uncovered |
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5.―Have you handed in your schoolwork yet?
―Yes，I have. I guess it ____ now. | A．has graded | B．is graded | C．is being graded | D．is grading |
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一Have you handed in your schoolwork yet?
一Yes,I have.I guess it _____ now.| A．has graded | B．is graded | | C．is being graded | D．is grading |
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Since 1 won the big prize，my telephone hasn’t stopped ringing. People____to ask how I am going to spend the money.| A．phone | B．will phone | | C．were phoning | D．are phoning |
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