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26. -We’re supposed to be there at 6:00?

   -_______ I know.

    A.As soon as    B.As far as  C.So long as D.As possible as

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25. I thought things would get better, but      it is they are getting worse.

    A.before         B.because        C.a(chǎn)s            D.a(chǎn)fter

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24. Although he knew little about the large amount of work done in the field , he succeeded    other more well-informed experimenters failed.

    A.a(chǎn)s            B.unless         C.what          D.where

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23. John waited at the bus-stop for nearly half an hour       the bus finally arrived .

    A.when          B.a(chǎn)s            C.before         D.while

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22. Not that I’m unwilling to lend you a hand ,      I’m too busy for the moment .

    A.because   B.but that   C.but   D.however

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21. Jack had traveled six miles across the Channel  _____his engine failed and was forced to land on the sea .   

    A.when          B.until           C.a(chǎn)fter           D.since

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20. _____ I know the money is safe, I shall not worry about it.

  A. Even though    B. Unless    C. As long as    D. While

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19. -When did he leave the classroom?

    -He left    you turned back to write on the blackboard.

    A.the minute      B.the time        C.until          D.before

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18.    he thought he was helping us with the work, he was actually in the way.    

    A.Although  B.Unless    C.Because   D.When

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17. Hearing his words ,I couldn’t decide      or remain .

    A.whether to go abroad              B.if I go abroad

    C.if to go abroad                   D.to go abroad

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