单项选择题

We have a high regard for Prof. Joseph because he always ______ his principles.

A. lives on
B. lives up to
C. lives through
D. lives with
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—Where is your farther —He ______ flowers in the garden.
A. waters
B. must water
C. must be watering
D. must have watered
单项选择题
It is strictly ______ that access to confidential documents is denied to all but a few.
A. secured
B. forbidden
C. regulated
D. determined
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