Mr. Smith began learning Chinese in his __________.

A．forty

B．forties

C．fortieth

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答案解析

句意：史密斯先生在40岁的时候开始学习中文。本题考查的固定搭配。in one’s+整十的数词复数可用来表示年龄，40的复数为forties。故B正确。【知识扩展】forty是基数词，意思是四十、fortieth是序数词，意思是第四十in one’s forties表年龄段，意思是四十多岁in forties意思是四十年代

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