单项选择题

How far people keep to each other while talking is closely associated with their ______ .

A．origin
B．culture
C．custom
D．nationality
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单项选择题
Hardly ______ when a loud explosion was heard.
A．the train had started
B．the train had been started
C．had the train started
D．the train started
单项选择题
After ______ for the job, as usual, you will be required to take a language test.
A．being interviewed
B．been interviewed
C．interviewing
D．having interviewing
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