题目内容
（请给出正确答案）
[单选题]
（)has been to Billy's house before he comes back.
A.his friends
B.Santa
C.the conductor
D.Sarah
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.his friends
B.Santa
C.the conductor
D.Sarah
如果结果不匹配，请 联系老师 获取答案
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