问题描述：
Mrs.White has a ring.(改为否定句) Mrs.White_________
Mrs.White has a ring.(改为否定句)
Mrs.White__________ __________ a ring.
注：一空一词.
Mrs.White has a ring.(改为否定句)
Mrs.White__________ __________ a ring.
注：一空一词.
问题解答：
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