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【单选题】

To review and assess achievements and summarize and exchange experience ______ the task of our presentCongress.

A、are
B、isC、were D、have been
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根据网考网移动考试中心的统计，该试题：

18%的考友选择了A选项

59%的考友选择了B选项

20%的考友选择了C选项

3%的考友选择了D选项

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