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题目
问个英语句型转换
I have been skating for two hours.(改为一般疑问句)
____ you _____ _____ for two hours?
He has been working since an hours ago(改为否定句)
He ___ ___ ____ since an hour ago
He started playing the piano (six years ago)(对括号的部分提问)
_____ _____ he _____ playing the piano?

提问时间:2020-10-26

答案
Have been skating
hasn't been working
when did start
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