单项选择题

A．To have fun.
B．To have a celebration.
C．To welcome their guest.
D．To welcome Cathy’s sister.
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单项选择题
A．They are little sheep.B．They are mice.C．They are lambs.D．They are little pigs.
A．They are little sheep.
B．They are mice.
C．They are lambs.
D．They are little pigs.
单项选择题
A．To invite him to attend a seminar.B．To inform him about some changes in the arrangement for his seminar.C．To invite him to visit the lab.D．To inform him that the seminar has been postponed.
A．To invite him to attend a seminar.
B．To inform him about some changes in the arrangement for his seminar.
C．To invite him to visit the lab.
D．To inform him that the seminar has been postponed.
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