摘要： -Who is the best friend of at school? -I think Helen is. We often help each other. A. mine B. his C. yours D. hers
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—Who is the best friend of _____ at school?
—I think Helen is. We often help each other.
—I think Helen is. We often help each other.
[ ]
A. mine
B. his
C. yours
D. hers
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B. his
C. yours
D. hers