单项选择题

--Is Mrs White in the office
--Yes, ______ she is on duty, she must be there.

A．since
B．until
C．for
D．if
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______ the punishment was unfair, he accepted it without complaint.
A．So long as
B．Even though
C．Since
D．While
单项选择题
______ are the days when teachers were looked down upon.
A．Gone
B．Go
C．To go
D．Going
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