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Since Jan 1, 2016, married couples _____...

Since Jan 1, 2016, married couples _____ to have two children.

A. have allowed    B. have been allowed    C. allowed    D. were allowed

 

B 【解析】考查时态和语态。句意:自从2016年1月1日,结婚的夫妇被允许生两个孩子。被动语态结构be+过去分词,现在完成时态的结构have/has+过去分词,since自从---,用于现在完成时态,结婚夫妇被允许生两个孩子,所以应用被动语态。A. have allowed 是现在完成时态但不是被动语态;C. allowed 是过去时态; D. were allowed是过去时态的被动语态; B. have been allowed是现在完成时态的被动语态。故选B  
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