2. 外语
  3. A series of measures______(已经被采用)to prevent air pollution.

A series of measures______(已经被采用)to prevent air pollution.

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问题 A series of measures______(已经被采用)to prevent air pollution.
选项
答案has been taken / adopted
解析 本题要注意主谓一致。“a series of+名词”谓语用单数，“a number of+名词”谓语为复数，“the number of+名词”谓语为单数。
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大学英语四级

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