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科目： 來源：不詳 題型：單選題

 —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： 來源：不詳 題型：單選題

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： 來源：不詳 題型：單選題

 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： 來源：不詳 題型：單選題

____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： 來源：不詳 題型：單選題

 —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： 來源：不詳 題型：單選題

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

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科目： 來源：不詳 題型：單選題

 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： 來源：不詳 題型：單選題

 John waited at the bus-stop for nearly half an hour _____ the bus finally arrived .
A．whenB．a(chǎn)s C．before D．while

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科目： 來源：不詳 題型：單選題

 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．unlessC．what D．where

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科目： 來源：不詳 題型：單選題

 I thought things would get better, but _____it is they are getting worse.
A．beforeB．becauseC．a(chǎn)sD．a(chǎn)fter

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