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        1. ---Where’s your father?
          ---He __________ to Singapore for a meeting. He ________ there twice.
          A.has gone, has beenB.has been, has gone
          C.has gone, has goneD.has been, has been
          A
          have been to 表示曾今去某地,而have gone to 表示已經(jīng)去了某地,故選A
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