单项选择题

Mr. Johnson had one eye injured in an accident, but after a ______ operation, he quickly recovered his sight.

A. precise
B. delicate
C. sensitive
D. considerate
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We must ______ that the procedure is followed as rigidly as possible.
A. secure
B. ensure
C. assure
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单项选择题
In the past most bus drivers have been men, but today the number of women ______ this field is climbing.
A. devoting
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