【題目】Confucius began to teach in his (thirties/ thirty).

【答案】thirties
【解析】句意：孔子在他三十多歲時開始教書。在某人幾十歲時用in one's+整十的復(fù)數(shù)，in one's thirties在某人三十多歲時。所以答案是thirties。

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