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18、Our elder son has been ______ the Continent for several months.

   A. knocking about                       B. knocking down             

   C. knocking over                        D. knocking off

18、A

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Our elder son has been ______ the Continent for several months.

   A. knocking about                       B. knocking down             

   C. knocking over                        D. knocking off

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