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            • 1．
              The best times to visit Shangri-la ______ spring and autumn because the temperature is _____ its mildest.

              A. is: in
              B. are; in
              C. is; at 
              D. are; at
              难度：中等
              解析 收藏 试题篮
            • 2．
              We ain't coming. Which of the following word can take the place of the underlined part in the above sentence？

              A. am not
              B. are not
              C. is not
              D. have not
              难度：较易
              解析 收藏 试题篮
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