The little girl's attention was suddenly caught by a rag doll which ______ put on the sofa, and she stopped crying.
【正确答案】 D
【答案解析】这个布娃娃“被放在沙发上”发生在“引起了小女孩的注意”之前，即“过去的过去”，所以用过去完成时。答案为D。