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35.From time to time a crocodile has snatched someone _______ he or she is even aware that the crocodile is there.

     A.when             B.until              C.since             D.before

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34._____ unemployment and crime are high, it can be assumed that the latter is due to the former.

     A.Before            B.Where            C.Unless            D.Until

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33._____the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.

     A.If                 B.While             C.Because          D.As

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