单项选择题

______ are the days when teachers were looked down upon.

A．Gone
B．Go
C．Togo
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
The palace was heavily guarded, because inside its walls ______.
A．where lived the Queen
B．lived the Queen
C．there lived the Queen
D．that lived the Queen
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