Question

—        ?

—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

Answer

B

【解析】

试题分析：句意：你的姐姐正在做什么？----她正在唱歌。A.Where is your sister你的姐姐在哪儿；B.What is your sister doing你的姐姐在做什么；C.What does your sister do你的姐姐是做什么工作的；D.Where is your sister singing你的姐姐正在哪儿唱歌。由答语She is singing.可知，是问你的姐姐在做什么。故选B。

考点：考查交际用语。