—Hi,Grace.Whatareyourparentsdoing?—Myfatheriswatchingaf...

问题详情：

— Hi, Grace. What are your parents doing?

— My father is watching a football match on TV 　　　 my mother is reading a book.

              A. while     B. when        C. so     D before 

【回答】

A

知识点：连词

题型：选择题