The cat is the only one of her pets she will have on her bed.
A. that, sleep
B. which, it sleeping
C. that, slept
D. that, it sleep
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(答案→)A. that, sleep
B. which, it sleeping
C. that, slept
D. that, it sleep
解析：考查定语从句和固定结构。定语从句That she will have sleep on the bed修饰先行词the only one. that指代the only one在句中做have的宾语。Have sb do sth让某人做某事；句意：这只猫是她的宠物中唯一的一个她让它睡在她床上的。