题目内容：

The cat is the only one of her pets she will have ( )on her bed.
A.it sleep B.it sleeping B.slept D.sleeping

优质解答

选D是对的,但是他们的解释不对
HAVE STH DOING 是一个固定结构,表示容许...做某事.
这里本来是HAVE IT SLEEPING ON HER BED 因为是定语从句.IT 被THAT 代替了,而THAT 省略了