I've been collecing them for five years改否定句

问题描述:

I've been collecing them for five years改否定句

I've not been collecing them for five years.
分析:I've not = I haven't
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改为:I haven't been collecting them for five years.
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答案:【I haven't been collecing them for five years 】
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I've been collecing them for five years.
改否定句:I haven't been collecting them for five years.