单项选择题

Yesterday when I left, they ______a meeting.

A. had
B. are having
C. were having
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单项选择题
An old lady (夫人，女士) turned ______ the air-hostess (空中小姐) for help.
A. around
B. to
C. down
单项选择题
______of the students is able to answer the question.
A. None
B. Nobody
C. No one
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