单项选择题

Mr. Black doesn't think that all bad practices should be allowed. In his opinion, there are______that should be kept up.

A．levels
B．degrees
C．standards
D．limits
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The new research project was led by the______engineer.
A．main
B．major
C．chief
D．primary
单项选择题
All but one______going to take part in the sports meet______tomorrow.
A．is; which is to hold is
B．are; to be taken place
C．are; to be held
D．that is to take place
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