Although the causes of cancer_____, we do not yet have any practical way to prev
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．are being uncovered | B．have been uncovering | C．are uncovering | D．have uncovered |
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答案
| A |
解析
| 因为句子的主语the causes of cancer与谓语uncover 是被动关系，因此我们使用被动结构，只有A 符合这一条件。 |
举一反三
—I’ve got to go now.
—Must you ?I ______you could stay for dinner with us.| A．think | B．thought | | C．have thought | D．am thinking |
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——— Ring me at six tomorrow morning， will you?
——— Why that early? I ______ . | A．will be sleeping | B．have slept | C．have been sleeping | D．will sleep |
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—He _______ to the meeting. Have you informed him of it?
—Sorry. I ________to.| A．hasn’t come; am going | | B．didn’t come; have forgotten | | C．hasn’t come; forgot | | D．doesn’t come; will have |
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Jane was disappointed that most of the guests ______when she _______ at the party.| A．left; had arrived | B．left; arrived | | C．had left; had arrived | D．had left; arrived |
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They ______ on the program for almost one week before I joined them, and now we _____on it as no good results have come out so far.| A．had been working; are still working | B．had worked; were still working | | C．have been working; have worked | D．have worked; are still working |
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