If we ___________some measures, we might have prevented the environmental pollu
题型：不详难度：来源：
If we ___________some measures, we might have prevented the environmental pollution．| A．take | B．had taken | C．took | D．have taken |
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答案
| B |
解析
| 考查虚拟语气。与过去事实相反时，从句用过去完成时，主句用情态动词+have done.句意：如果我们采取了一些措施，我们也许就可以阻止环境污染。 |
举一反三
—Sorry, Mr. Wang. I didn’t finish the assignment yesterday.
Oh, you ________ have done it as yesterday was the deadline.| A．must | B．mustn’t | C．should | D．shouldn’t |
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—Do you know where David is? I can’t find him anywhere.
—Well . He have gone far— his coat’s still here. | A．shouldn’t | B．mustn’t | C．can’t | D．wouldn’t |
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We shouldn"t have come north for Christmas vacation. If we _______, we wouldn"t be stuck in the snow right now.| A．wasn"t | B．didn"t | C．hadn"t | D．weren"t |
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| How ___Mike have refused such a good opportunity to go abroad for further study? |
Meng Peij ie，an ordinary girl who was among the 10 people awarded the title of “Touching China 2011”，must be both optimistic and strong-minded. Otherwise, she _______ her disabled adoptive mother for 12 years.| A．mustn"t have looked after | B．can"t have looked after | | C．couldn"t have been looking after | D．shouldn"t have looked after |
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