题目内容：

The news that they failed their driving test discouraged him,( )? a:did they b:didn't they c:did it
d:didn't it

优质解答

The news (that they failed their driving test) discouraged him,
括号内同位语从句,主句是The news discouraged him,
主语是news,单数 反义疑问 用 it 指代
谓语是过去时discouraged用 did：前肯后否,didn't
所以选D\
）