Martha told me that she ________ 40 years old by the end of last year, however she still looked very young and energetic．A.would beB.would have beenC.has beenD.was
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D解析本来看到时间状语by the end of last year，就应该用完成时态。但是，如果动词表示状态，则仍然用一般时而不用完成时：By the end of last month, they had already finished school．By the end of last month I was in New York．