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        1. It's four o'clock.Betty ________ the piano.

          [  ]

          A.

          is playing

          B.

          is playing on

          C.

          plays

          D.

          plays on

          答案:A
          解析:

            前面有時(shí)間點(diǎn),說明某一動(dòng)作正在進(jìn)行。


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