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        1. It's necessary for us ________ them every day.

          [  ]

          A.

          walking

          B.

          to walk

          C.

          walks

          D.

          to walking

          答案:B
          解析:

          It's necessary for sb.to do sth.意為“對某人來說干某事很有必要”。此處walk意為“溜”“牽著動物散步”,them指貓、狗等一些寵物。


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