题文
I had been working on math for the whole afternoon and the numbersbefore my eyes.
| A． | swim | B． | swum |
| C． | swam | D． | had swum |
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I had been working on math for the whole afternoon and the numbersbefore my eyes.
| A． | swim | B． | swum |
| C． | swam | D． | had swum |
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