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35.---     was it     they discovered the entrance to the underground palace?

   --- Totally by chance.

    A.What; that      B.How; that       C.When; how     D.Where; that

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34.--- Is there any possible way to help them get rid of such a bad habit?

   --- To tell the truth, it’s very hard. But we     on this problem trying to improve the situation.

    A.worked                        B.had worked    

    C.are working                     D.had been working

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