A series of measures______(已经被采用)to prevent air pollution.has been taken / adopt

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

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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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