Even as profits slumped, investors in the s&p 500 benchmark index earned 14.3% in 2020, about double the typical return over the past 20 years.
about double the typical return over the past 20 years
这部分是名词词组,为14.3%的同位语。double在此为倍数词,作return的前位限定词。double在此不是动词。你看看句子谓语动词为过去时态。
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