组卷网 > 高中英语综合库 > 语法 > 词法 > 数词 > 基数词
题型:单项选择 难度:0.65 引用次数:206 题号:7526223
The old professor still works hard though he is _________.
A.in his sixtyB.in his sixties
C.in sixtiesD.in the sixty
【知识点】 基数词解读

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