The USA is a______(发达)country.将After calling a few more times my mother has to come upstairs改成否定句

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The USA is a______(发达)country.将After calling a few more times my mother has to come upstairs改成否定句
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The USA is a______(发达)country.将After calling a few more times my mother has to come upstairs改成否定句
The USA is a______(发达)country.
将After calling a few more times my mother has to come upstairs改成否定句

The USA is a______(发达)country.将After calling a few more times my mother has to come upstairs改成否定句
developped(发达的)
If not having called a few more times,mother do not have to come upstairs.

developed

developed
has to 变为doesn't need to

1developed只有一个p
因为根据汉语和事实”美国上一个发达国家”
2have to在变否定句时要和needn't 或don·t have to互相转换
因为mustn`t是禁止的意思很显然不符合题意
再根据本句应用单三所以应变为 needn't 或doesn·t have to