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
In Disneyland, every year, some 800, 000 plants are replaced because Disney refused to ______ signs asking his guests not to step on them.
A．take down
B．call for
C．put up
D．set up
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