高考英语介词和介词短语练习9

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• 71The thief glanced about now and then ________ he knew he was being followed．

  A.even if

  B.as though

  C.in case

  D.so that

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• 72His letter was indeed confusing-time and time again I read it, still I couldn't make ________ of it．

  A.explanation

  B.meaning

  C.guess

  D.sense

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• 73The newly learnt words will soon be forgotten ________ frequently used in everyday communication．

  A.if they are

  B.unless they are

  C.when they are

  D.till they are

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• 74No one can attain great achievements ________ he concentrates on what he is doing, even though a talent．

  A.because

  B.while

  C.unless

  D.if

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• 75We'll fight against him to the end ________ he gives in．

  A.if

  B.as long as

  C.when

  D.unless

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• 76One is easy to ________ if he gets used to the surroundings quickly．

  A.line

  B.survive

  C.get along

  D.be alive

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• 77Camels can ________ for many days with no water．

  A.remain

  B.survive

  C.stay

  D.continue

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• 78Do you know when the Anti-Japanese War ________?

  A.broke out

  B.broke up

  C.broke in

  D.broke off

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• 79________ enough emphasis is put on English pronunciation, few students will pay attention to it．

  A.When

  B.Unless

  C.If

  D.Until

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• 80We shouldn't do that dangerous experiment ________ the teacher is with as．

  A.if not

  B.if

  C.unless

  D.as long as

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