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20.I really don’t know _______I kept the secret papers.

    A.where was it                 B.it was where that        

    C.where it was that             D.where was it that

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19.The problem ________now is very important.

    A.being discussed              B.discussed     

    C.discussing                  D.to be discussed

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18.- According to my grandma, it is a good idea to eat chicken soup when you have a cold.

  -________, scientists agree with her.

    A.Sooner or later               B. Once in a while        

    C.To be exact                 D.Believe it or not

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17.- Catherine, I have cleaned the room for you.

- Thanks, but you ________it.I could manage it myself.

    A.needn’t do                 B.needn’t have done 

    C.mustn’t do                  D.shouldn’t have done

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16._______from the top of the tower, the north foot of the mountain is a sea of flowers.

    A.Seeing                   B.Having seen           

    C.Seen                     D.To see

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