单项选择题

You may not go out to play games ______ you have finished your work.

A．as
B．while
C．until
D．when
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Which bus should the man take to get to Prince Street
A． Bus No. 12.
B． Bus No. 30.
C． Bus No. 13.
单项选择题
What is the relationship between the man and the woman
A． Teacher and student.
B． Doctor and patient.
C． Husband and wife.
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