单项选择题

We must ______ that the procedure is followed as rigidly as possible.

A. secure
B. ensure
C. assure
D. issue
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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
B. engaging
C. registering
D. pursuing
单项选择题
James has just arrived, but I didn't know he ______ until yesterday.
A. will come
B. was coming
C. had been coining
D. comes
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