单项选择题

It is quite necessary for a qualified teacher to have good manners and （）knowledge.

A. extensive
B. learned
C. intensive
D. comprehensible

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（）one time, Manchester was the home of the most productive cotton mills in the world.

A. On
B. By
C. At
D. Of
单项选择题
The man to whom we handed the forms pointed out that they had not been （）filled in.

A. consequently
B. frequently
C. comprehensively
D. properly
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