前一句强调我已经完成作业,所以用现在完成时.而后面一句用when引导,从时态上不可能是完成时（when是具体某个时间,不是一段时间）,可能的选项就只有一般过去与一般将来（一般现在是对普通的客观状况陈述,而此处是对一件具体的事进行陈述,故不适合用它）.如果没有一般讲来,就只能选一般过去了,所以did ；finish.
I have finished my homework.When _____you_____it?为什么填didi,fi
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