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    Is necessary to take off our shoes when we enter the computer lab? A. this B. it C. everyone D. he 【查看更多】

     

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    Is _____ necessary to take off our shoes when we enter the computer lab?

      A. this           B. it           C. everyone      D. he

     

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    Is _____ necessary to take off our shoes when we enter the computer lab?

      A. this        B. it        C. everyone    D. he

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