I had been working on math for the whole afternoon and the numbers()before my eyes.A、swim B、swum C、swam D、had swum选哪一项,为什么?
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![I had been working on math for the whole afternoon and the numbers()before my eyes.A、swim B、swum C、swam D、had swum选哪一项,为什么?](/uploads/image/z/11869133-5-3.jpg?t=I+had+been+working+on+math+for+the+whole+afternoon+and+the+numbers%EF%BC%88%EF%BC%89before+my+eyes.A%E3%80%81swim+++B%E3%80%81swum+++C%E3%80%81swam+++D%E3%80%81had+swum%E9%80%89%E5%93%AA%E4%B8%80%E9%A1%B9%2C%E4%B8%BA%E4%BB%80%E4%B9%88%3F)
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