【題目】Alibaba CEO Jack Ma has decided to retire from his company in his _________．

A. fiftyB. fiftiesC. fiftiethD. fiftieths

【答案】B

【解析】

句意：阿里巴巴CEO馬云已經決定在他50多歲從他的公司退休．fifty50（基數(shù)詞）；fiftieth第50（序數(shù)詞）；fifties用于in one’s fifties“在某人50多歲時”，根據(jù)句意可知，表示“在他50多歲時”，故選B。

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