By the end of the ______ century(世纪,百年) ,computers may be seen in every home.

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问题 By the end of the  ______  century(世纪,百年) ,computers may be seen in every home.

选项 A、twenty-first
B、twenty-oneth
C、twentieth-one

答案A

解析 表示某个世纪,用序数词。
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