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

游客2024-02-28  20

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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