4.He looked quite healthy though he was_______.

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4.He looked quite healthy though he was_______.
A.in seventy B.at seventies C.in his seventies D.at the age of seventieth
参考答案是C
D为什么不可以?
请用最幼稚的语言解释

答案是C,没错.
因为D项错在它的答案里用了序数词.
At the age of后面应该用基数词,所以错误.
好的,依你的,用最幼稚的语言解释.
seventieth是"第十七"的意思.所以D项at the age of seventieth就是在第十七岁时,
而C项in his seventies,就是"在十七岁"时.所以要选C啊~
..明白了吗?

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