单项选择题

A．They are friends
B．They are strangers
C．They are brother and sister.
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填空题
went back the farm→went back to the farm
单项选择题
A．Yes, he did.B．No, he didn’t.C．We are not sure.
A．Yes, he did.
B．No, he didn’t.
C．We are not sure.
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