2. 外语
  3. ______ (到了有关当局采取措施的时候) solve traffic problems.

______ (到了有关当局采取措施的时候) solve traffic problems.

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问题 ______ (到了有关当局采取措施的时候) solve traffic problems.
选项
答案It is time the authorities concerned took measures to
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大学英语六级

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