题目：
完成对话：在对话后面的句子中选出正确的填入空白处。
Jim: Excuse me, Ann. Whose black dog is this? Is it yours?
Ann: Let me have a look. 1. . I think it's Sam's. My dog is brown.
Jim: Sam, look at the dog behind the tree. 2. ?
Sam: Sorry, it isn't mine. My dog is black and white. I think it looks like Mary's.
Jim: 3. ?
Sam: She's my friend. Look! She's over there. Let's go and ask her.
Jim: 4. .
Sam: Hi, Mary! Is that dog yours?
Mary: 5. .
Sam: It's a lovely dog! Don't lose it!
Mary: Yes, thank you.
A. Who's Mary
B. OK, let's go
C. Oh, no it's not mine
D. Oh, yes. It's mine
E. Is it yours
答案：
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