单项选择题

A．A math teacher and his colleague.
B．A teacher and his student.
C．A student and his classmate.
D．A librarian and a student.
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单项选择题
A．She will save stamps for the man’s sister.B．She can’t give stamps to the man’s sister.C．She will no longer get letters from Canada.D．She has given the stamps to the man’s roommate.
A．She will save stamps for the man’s sister.
B．She can’t give stamps to the man’s sister.
C．She will no longer get letters from Canada.
D．She has given the stamps to the man’s roommate.
单项选择题
In the Middle Ages people believed it was the earth, not the sun, _____ the center of our planetary system.
A．was that
B．that was
C．was
D．that
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