Were your doing your homework when your father came back?A,did B,were ,C,was,D,will 选什么,为什么

Were your doing your homework when your father came back?A,did B,were ,C,was,D,will 选什么,为什么
Were your doing your homework when your father came back?A,did B,were ,C,was,D,will 选什么,为什么

Were your doing your homework when your father came back?A,did B,were ,C,was,D,will 选什么,为什么
B,were
(Were) you doing
当你爸爸回来时,你正在做作业吗?
过去进行时.
when 的时间状语从句,一般都是一个一般时,一个进行时.

B
过去进行时

B
when your father came back 时间状语，可以把其看做时间点，在这个过去的时间点干某事，应用过去进行时 Were doing