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
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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
单项选择题
The scientists often meet with problems that______new type of instruments for their solution.
A. inquire
B. require
C. acquire
D. squire
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