◎ 题干
Half of the workers here ______ under twenty _______.
[     ]
A. is; years  
B. are; year old  
C. is; years old    
D. are; years of age
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Half of the workers here ______ under twenty _______. [ ]A. is; yearsB. are; year old C. is; years old D. are; years of age…”主要考查了你对  【介词和介词短语】【主谓一致】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。