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            • 1． I"m sorry you______________so long， but it"ll still be some time before Jim gets back．（　　）
              A．wait
              B．waited
              C．had waited
              D．have been waiting
              难度：中等
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            • 2． We ______ in the town since our ancestors moved here many years ago.
              A．live
              B．lived
              C．have lived
              D．are living
              难度：中等
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            • 3．

              — Where have you been? We’ve been _______ you everywhere.

              — Sorry, I met a friend just now and talked with him outside.

              A．looking out
              B．looking for
              C．looking after
              D．looking up
              难度：中等
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            • 4．
              We have been                 (滑冰) for a long time.
              难度：中等
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