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            • 1．

              Pointing to the house on _____ roof grew lots of bush , the old man told me that was ________ I would stay.

              A．its ; what          B．whose; what       C．whose; where      D．its; where

               

              难度：难
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            • 2．

              He made another wonderful discovery,_____ of great importance to science.

              A．which I think is

              B．which I think it is

              C．which I think it

              D．I think which is

               

              难度：难
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            • 3．

              Another drug that has helped improve people’s health is penicillin, _________ is _________ by many _________ one of the most important medicines.

              A．which, considered, being                 B．that, considering, been

              C．that, to consider, being                   D．which, considered, to be

               

              难度：难
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