My sister is talking on the phone________________________划线部分提问is talking on the phone划线
问题描述：
My sister is talking on the phone
________________________划线部分提问
is talking on the phone划线
答
who is talking on the phone?
答
What is your sister doing?
哪划线啦？
哦，你补充啦？Who is talking on the phone?
答
What is your sister doing now?