我认为两种答案都对,haven't done 强调还没有做这个概念,而 am doing 是说马上要做,口语中常说的（这时现在进行时表将来的概念,例如I'm coming.I'm going to school）.
客观地说,am doing更好一些,因为not yet已经包含了“没有做”这一层意思了.
用所给词的正确形式填空.Have you done your homework yet?Not yet.I( ) (do
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