单项选择题

Although Helen is a new teacher, she knows () student in her class.

A. every of
B. every
C. all
D. all of

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单项选择题

() you have finished your work, you are free to do what you like.

A. Now that
B. Ever since
C. For now
D. By now

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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