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

who is talking on the phone?

What is your sister doing?
哪划线啦?
哦,你补充啦?Who is talking on the phone?

What is your sister doing now?