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D
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单项选择题
A．He has stayed on campus.B．He has been in an academic conference.C．He has been ill in hospital.D．He has been on vocation.
A．He has stayed on campus.
B．He has been in an academic conference.
C．He has been ill in hospital.
D．He has been on vocation.
单项选择题
A．His classmates know the woman’s mum.B．His classmates sends him the letters.C．He already promised to introduce his classmates to the woman’s mum.D．He already promised to save the stamps for his classmates.
A．His classmates know the woman’s mum.
B．His classmates sends him the letters.
C．He already promised to introduce his classmates to the woman’s mum.
D．He already promised to save the stamps for his classmates.
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