题干
— ______?
— She is singing.
A：Where is your sister
B：What is your sister doing
C：What does your sister do
D：Where is your sister singing
答案(点此获取答案解析）
B
— ______?
— She is singing.
A：Where is your sister
B：What is your sister doing
C：What does your sister do
D：Where is your sister singing
