问题
选择题
________ should not to be allowed to work at night.
A．Sixteen-year-olds
B．Sixteen-years-old
C．Sixteen year olds
D．Sixteen-years-olds
答案
A
题目分析：句意：16岁的孩子们不应允许夜间工作。形容语转换成名词，表示某一类人，故选A。
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