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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单项选择题
In order not to be disturbed, I spent three hours () in my study.

A.locking
B.locked
C.to lock
D.being locked
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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