What she for vacation?A. does doesB. is doingC. is do D. are doing

问题补充：

What she for vacation?

A. does，does

B. is doing

C. is do

D. are doing

答案：

A. does，does

(答案→)B. is doing

C. is do

D. are doing

解析：根据语境可知时态为选择进行时

故排除AC

又因为she为第三人称单数形式

故谓语动词应用is

故选B