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20.Many of them turned a deaf ear to his advice,   they knew it to be valuable.

A. even though   B.now that   C. as if   D.so that

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19.With the temperature    so rapidly, we couldn’t go on with the experiment.

  A. fall    B. fell    C. falling   D. fallen

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18.How did it    that he knew where we were?

  A.bring about   B.bring in  e about  e across

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