I had been working on math for the whole afternoon and the numbers______before my eyes.

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问题 I had been working on math for the whole afternoon and the numbers______before my eyes.

选项 A、swim
B、swum
C、swam
D、had swum

答案C

解析 首先排除B项,A项的时态为一般现在时,也排除。D项为过去完成时,不符合题意。正确答案为C项。
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