The old professor still works hard though he is _________.A．in his sixtyB．in his_刷题宝

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The old professor still works hard though he is _________.

A．in his sixty	B．in his sixties
C．in sixties	D．in the sixty

上一题下一题 0.65难度单项选择更新时间:2019-01-29 06:39:45

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