单项选择题

A．that
B．which
C．what
D．who
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单项选择题
A．mostB．leastC．moreD．less
A．most
B．least
C．more
D．less
单项选择题
When will the passengers be able to get up again
[A] When an air-hostess says so.
B. When the seat-belt sign goes off.
C. When the captain makes another announcement.
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