2. 外语
  3. To review and assess achievements and summarize and exchange experience ______the task of our present Congress.

To review and assess achievements and summarize and exchange experience ______the task of our present Congress.

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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 主谓一致性题。本题的主语是个较长的不定式短语，谓语动词应用单数，故选[B]。
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