单项选择题

The television networks believe that the period between 6 p. m. and 11 p. m. is the______television viewing time.

A．prime
B．primitive
C．primary
D．principal
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You had better______me about the reason for your dismissal.
A．level off
B．level at
C．level with
D．level up
单项选择题
Only after the anesthetist gave the patient an anesthetic______.
A．the operation could be conducted
B．could the operation be conducted
C．could be conducted the operation
D．the operation conducted could be
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