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    科目： 来源：不详 题型：单选题

     —Will you go to Mary’s birthday party?
    —No, ____ invited, I can’t go to it. I’ll be too busy then.
    A．ifB．unlessC．even thoughD．when

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    科目： 来源：不详 题型：单选题

    Questions and exercises  are given by the computer, which decides ______ to move the students ahead, review an easier level, ____ give more work on the same level.
    A．either, orB．both, and .C．whether, orD．not only, but also

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    科目： 来源：不详 题型：单选题

     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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    科目： 来源：不详 题型：单选题

    ____he thought he was helping us with the work, he was actually in the way.            
    A．AlthoughB．UnlessC．BecauseD．When

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    科目： 来源：不详 题型：单选题

     —When did he leave the classroom?
    —He left _____you turned back to write on the blackboard.
    A．the minuteB．the timeC．untilD．before

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    科目： 来源：不详 题型：单选题

     Jack had traveled six miles across the Channel  _____his engine failed and was forced to land on the sea .     
    A．whenB．until C．after D．since

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    科目： 来源：不详 题型：单选题

     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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    科目： 来源：不详 题型：单选题

     John waited at the bus-stop for nearly half an hour _____ the bus finally arrived .
    A．whenB．as C．before D．while

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    科目： 来源：不详 题型：单选题

     Although he knew little about the large amount of work done in the field , he succeeded ____other more well-informed experimenters failed.
    A．as B．unlessC．what D．where

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    科目： 来源：不详 题型：单选题

     I thought things would get better, but _____it is they are getting worse.
    A．beforeB．becauseC．asD．after

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