I had been working on math for the whole afternoon and the numbers（）before my eyes.
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?
A、swim B、swum C、swam D、had swum
选哪一项,为什么?
英语人气：136 ℃时间：2019-11-08 11:04:34
优质解答
had been working 过去完成时态 表明这个动作在过去的某个时段已经完成了 the numbers swam before my eyes一个过去式就ok了 其实swam就已经有过去的意思了 无论多久的过去.had swum感觉上说 已经眼花 什么的额 不好
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