they___(watch)TV in the living-room when I saw them.

问题描述:

they___(watch)TV in the living-room when I saw them.
空里怎么填?这句话是什么时态的以后遇到这种题要怎么做?

they were watching TV in the living-room when I saw them.
过去完成时
when+一般过去式的从句,一般和过去进行时搭配怎么多了个were“过去完成时”说错了 不是“过去完成时” 是过去进行时 过去进行时 所以 sb were doing sth