单项选择题

A．They are working in the office.
B．They are talking on the phone.
C．They are playing in the school.
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单项选择题
A．Johnson’s friend.B．Johnson．C．Richard．
A．Johnson’s friend.
B．Johnson．
C．Richard．
单项选择题
A．Yes, I am.B．Yes, I do.C．No, I am.
A．Yes, I am.
B．Yes, I do.
C．No, I am.
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