have you decided yet?yes,i decided at once为什么钚用have decided 或will decided

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have you decided yet?yes,i decided at once为什么钚用have decided 或will decided
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have you decided yet?yes,i decided at once为什么钚用have decided 或will decided
have you decided yet?yes,i decided at once为什么钚用have decided 或will decided

have you decided yet?yes,i decided at once为什么钚用have decided 或will decided
回答时,事情是过去发生了的,没必要再用完成时,更不能用将来时,因为回话者已经先回答了yes,说明基本肯定了问方的内容.

这是对话。第一句是说明动作已经完成,不强调时间,所以用完成时态。第二句是问什么时间做的动作,因为写作业的动作发生在过去,所以用B做答案 When