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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$I had been working on math for the whole afternoon and the numbers（）before my eyes.A、swim B、swum C、swam D、had swum选哪一项,为什么?$

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?
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?

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?
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

C.因为前面是过去完成进行时，所以时态一致那为何不用had swum，时态不是也一致吗？为何却只选一般过去时呢？而且had been working 要用过去完成进行时态呀？如果用现在完成时态的话，按照你的逻辑是不是就选swim呀？拜托，我好糊涂呀！had been 必须是过去的过去，难道还没做数学题就眼花了吗？...

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C.因为前面是过去完成进行时，所以时态一致

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选C
and前后保持时态一致，前面是had been working过去完成进行时，所以后面也要用一个和过去有关的事态，所以排除A,B，had swum选还是不选有两个条件，1. 原文中有过去式（符合）2. Had swum的动作要发生在过去式动作之前（不符合）所以排除had swum，答案最终选择C那为什么前面用had been working ，难道had been working发生...

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选C
and前后保持时态一致，前面是had been working过去完成进行时，所以后面也要用一个和过去有关的事态，所以排除A,B，had swum选还是不选有两个条件，1. 原文中有过去式（符合）2. Had swum的动作要发生在过去式动作之前（不符合）所以排除had swum，答案最终选择C

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D,强调过去对现在的影响

选C

had been working是动作发生在过去的过去，所以，需要一个过去时来帮助构成过去的过去。

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