To review and assess achievements and summarize and exchange experience________t

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问题 To review and assess achievements and summarize and exchange experience________the task of our present Congress.

选项 A、are
B、is
C、were
D、have been

答案 B

解析当前我们国会的任务是回顾和评价成绩并总结和交流经验。主谓一致题。本题的主语是一个较长的不定式短语，谓语动词应用第三人称单数形式，故选B项。

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