she is writing a letter.(对划线部分提问） ---------------
问题描述：
she is writing a letter.(对划线部分提问） ---------------
答
What is she writing?
答
划线部分若是writing a letter的话，答案就应该是：What is she doing ?
划线部分若是she的话，答案就应该是：Who is writing a letter ?
答
1.对she划线：Who is writing a letter?
2.对 writing a letter划线：What is she doing?
3.对a letter划线：What is she writing?
答
你好
What is she doing?
她在做什么
划线部分是：writing a letter
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