单项选择题

He was proud of being chosen as a representative and he______them that he would try his best.

A. insured
B. ensured
C. assured
D. guaranteed
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单项选择题
It was recommended that passengers______use their cell phones during the flight.
A. not
B. need not
C. could not
D. would not
单项选择题
______at the stadium came to their feet, paying attribute to the wonderful performance of the soccer team.
A. Observers
B. Participants
C. Spectators
D. Audience
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