a是表示当他正明白这件事的时候,实际上他是在明白之后才作出了接下来的动作.另外,句子的整体意义只是叙述过去发生的一件事.还有就是,过去发生的一件具体事情最好都用过去式,除非有特别明显的标记是说正在发生或者是有强调完成态的意味.这也能够解释为什么选C不选B,本来按照语法和意义,B也能选.
When_____ that this was no ordinary fish, he tried not to da
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